When comparing Dropbox vs Amazon Zocalo, the Slant community recommends Dropbox for most people. In the question“What are the best cloud storage services?” Dropbox is ranked 9th while Amazon Zocalo is ranked 36th. The most important reason people chose Dropbox is:
You can use Dropbox via website, by installing a desktop client that creates a folder that you simply drag and drop files into, or with their mobile app. Everything synchronizes across all devices used and cloud storage. And Dropbox offers easy methods of sharing whatever is within it.
Specs
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Pros
Pro Easy to use
You can use Dropbox via website, by installing a desktop client that creates a folder that you simply drag and drop files into, or with their mobile app. Everything synchronizes across all devices used and cloud storage. And Dropbox offers easy methods of sharing whatever is within it.
Pro Cross-platform desktop and mobile
Dropbox is available on iOS, Android, BlackBerry, Windows, OS X and Linux. By having a client for so many OS's pretty much anyone is covered no matter what kind of device or OS they are using.
Pro Allows sharing a folder
Using a desktop client: right click on the folder you want to share and select Dropbox > Share This Folder, then enter the e-mail addressees of people you want to share the folder with.
Pro Smart updates to big files
If a small portion of the file is changed it sends/receives only the differences (not the whole file), which is fast and bandwidth-efficient.
Pro Allows sharing a single file via link
Whether using desktop client or web interface, simply right click on the file you want to share and select Dropbox > Share link, then send the link to the people you want to share the file with. The recipient does not require a Dropbox account.
Pro Up to 18GB of free storage space
Dropbox personal accounts start out free, with 2GB of space, but users can get extra space by recommending the site to friends, or taking part in events like "Dropquest", where users can win extra space by solving puzzles.

Pro Linux support
Dropbox offers native Linux support, integrates with Nautilus file manager.
Pro Reliable
Pro Desktop client has no file size limit
As long as you have enough storage available, you can upload files of any size using Dropbox desktop client.
Pro Folders can be downloaded compressed to save bandwidth
To save bandwidth and download speed you can choose to compress a folder into a zip archive for download.
Pro Adjustable bandwidth use
To not slow down the network or save traffic you can limit the upload and download speeds of Dropbox.
Pro Lots of addons and integrations
There are official and third-party Dropbox add-ons that extend the functionality of the service and add ease of use of existing features.
Additionally, Dropbox can be integrated with existing applications to bring its functionality to other apps.
Pro 30-day version control
Dropbox keeps deleted and earlier versions of files for a month.
Pro Instant disaster recovery
Your files always synced online means instant disaster recovery. When your hard drive becomes unbootable, pick up another laptop and just carry on with your life from where you last saved.
Pro Available free storage can be increased with referrals
You get extra free space for you and your friend if they sign up.
Pro Fast sync speed
Pro Simple Document Feedback
Amazon Zocalo lets users quickly access and gather feedback on files. Users can comment on files, send them to others for feedback, and upload new versions without emailing files as attachments. Teammates can leave comments by highlighting a section of a file, or specific text, and typing feedback. Users can set optional deadlines for feedback, track files that are out for review, and are notified by email when they have been asked to provide feedback. Amazon Zocalo automatically stores previous versions of every file so that users do not have to. Amazon Zocalo uses an innovative overlay technology that enables users to see all the comments from others that they have been working with consolidated in one place. Microsoft Word users who prefer working with comments directly in a Word document can download a version of the document with the comments included.
Pro Integrate your Corporate Directory
Amazon Zocalo can integrate with your existing Active Directory. This means that your users can easily access Amazon Zocalo using their existing Active Directory credentials, and allows you to control which users in your organization are permitted to access the service.
Pro Secure
Amazon Zocalo offers flexible security settings and access controls to manage data storage and sharing. You can use policies to control users’ sharing behavior, choose the AWS Region where your users’ data is stored, and view audit logs to track document and user activity. All data is encrypted in transit and at rest, and users don’t have to send documents as email attachments.
Pro Low Cost
Priced at $5 per user per month, including 200 GB of storage, Amazon Zocalo is a low cost solution that is also fully managed. This means that there is no hardware to purchase and maintain and no software to deploy. You simply enable Amazon Zocalo for your organization and invite users. A 30-day free trial for up to 50 users with 200 GB of storage per user is available to help you get started.
Pro Central Hub
Amazon Zocalo provides users with a central location for both the documents and files they are reviewing as well as those they own and are soliciting feedback on. With all these files in one location, reviewers have access to all of the related feedback in a single web view, making reading or contributing comments as simple as a few clicks.
Pro Access and Sync from Any Device
Users can access files stored in Amazon Zocalo and view and leave feedback on files anywhere, anytime, from the device of their choice. Users can leverage the Amazon Zocalo apps for iPad, Kindle Fire, and Android tablets. The Amazon Zocalo Sync client lets users have files saved on their computer automatically uploaded to Amazon Zocalo over an encrypted connection and synced across their other devices.
Cons
Con Too little free space
There is just too little of free space available comparing to the competition.

Con Not secure
They don't apply end-to-end encryption, files are visible to admins, governments, etc..
Con No privacy
Extensive collecting and distribution of user data to commercial third parties.
Con Consumes a lot of CPU resources when syncing many files
Con All-or-nothing (non-selective) upload
Uploading generated contents (cache, compiled code, etc.) is prone to conflicts, wastes bandwidth and free space.
Con Low bandwidth
Con Dropbox keeps deleting features, chasing customers away
For instance, all photo albums got deleted. It used to be very easy to share a couple og photos, now it's PAINFUL and must be done file by file.
Con Nocive development model
Takes a lot of decisions that usually damage community, from deleting features to making impossible to use with other filesystems than ext4 because they decided without a plausible reason (they said it was about xattrs, but all modern linux filesystems supports xattrs, so it's bs.)(they remove this later, but it's too late).
Con Problems when synching between Linux and Windows devices (unconfirmed)
This summer I lost thousands of files due to this problem on older projects which subsequently needed revising and had to be rebuilt as tons of the source was gone.
Con Restricted only to 3 devices for FREE accounts
Recently dropbox decreased the number of linked devices to 3, so you can't have more than 3 linked devices. This is problematic if you use Dropbox to sync between your computers.
Con Can unintentionally delete your files if you reinstall your OS without closing Dropbox
If you reinstall the operation system for your PC and you do not close Dropbox, it will delete all files.
Con Currently in Limited Preview
