When comparing Namecheap vs Dropbox, the Slant community recommends Namecheap for most people. In the question“What are the best website hosting providers?” Namecheap is ranked 12th while Dropbox is ranked 16th. The most important reason people chose Namecheap is:
Domain registration at Namecheap is economical, as their name implies.
Specs
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Pros

Pro Low prices
Domain registration at Namecheap is economical, as their name implies.
Pro Great support with 24 hour live chat
Namecheap support is available 24 hours a day, every day of the year. Their support is provided over live text chat, which has a lower barrier to entry, faster connection, and allows you to communicate easier than other the phone.
Because most of the support you need for domains require you to provide text configuration data, live online messaging is the most efficient way to get fast support. It also does not require your constant attention so you don't have to waste time while the operator is researching an answer for you.
Pro Free subdomains
Namecheap allows you to set up 198 subdomains for free, and also provides wildcard subdomain catching so you can manage them yourself.
Pro Free e-mail and URL forwarding
Namecheap allows you to set up 100 virtual email addresses per domain, as well as catch all forwarding all undefined addresses.
Pro Supports credit cards, PayPal and adding funds to your account separately
When it comes to paying for domains, Namecheap supports all common payment methods. For most people this will be credit cards and Paypal, but Namecheap also has an option to add funds to your account separately.
Pro Free dynamic DNS routing
Pro Strong Anti-SOPA stance
Namecheap took a stand against SOPA.
Pro FreeDNS for outside domain
Namecheap offers a free and premium (w/ SLA) DNS hosting service for domains registered with other registrars.
Pro Free WHOIS privacy protection
It's active for one year.
Pro Bitcoin payment support
Pro Expiration grace period
Namecheap will notify you if your credit card is going to expire, and has a 27 day non-guaranteed grace period for renewal.
Pro Two-factor authentication
Pro Proactive support
Not all registrar care, but when there's an error or something held up the registration they've always at least gave it a shot without prompting. This is done in a proactive way, which isn't seen very often at all. This way the user can be hands off and not need to deal with certain issues as it is taken care of in the background by their support. User is still informed, of course, but can be entirely hands off, or not, but usually they've been efficient and transparent.
Pro Free .me domain for students
Through its NC.ME program, students can get a free 1-year registration on the .me TLD and discounts on .com, .io, and other TLDs along with Namecheap Private Email hosting.
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
Cons
Con Misleading pricing
For example .me domain registration costs 3$ a year, but a continuation for 2 years cost 30$!
Con Expensive
It costs a lot of money to renew and purchase a domain. It also costs for their premium dns. They used to be cheap, but now it's so expensive.
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.
