When comparing Amazon Appstore vs DownloadAtoZ, the Slant community recommends Amazon Appstore for most people. In the question“What is the best Google Play Store alternative?” Amazon Appstore is ranked 8th while DownloadAtoZ is ranked 14th. The most important reason people chose Amazon Appstore is:
"Actually free" apps with free in-app purchases. This only applies to a selection of older apps with the "actually free" banner, not to everything.
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Pros
Pro Amazon Underground
"Actually free" apps with free in-app purchases. This only applies to a selection of older apps with the "actually free" banner, not to everything.
Pro Sideloads on any Android device
It's not just for Kindle.
Pro Convenient
Using the Amazon Appstore is pretty convenient as a very large portion of the population already have an Amazon account from using their normal website for ordering goods. Also the fact that they allow anyone to install the store onto their devices means the users collection of apps can be installed easily.
Pro Apps don't need the Google Play services
Amazon uses its own API.
Pro Amazon developer services
Amazon offers app publishing to their users along with tools to pre-test their apps for compatibility. This allows for easy access to publishers in order to get their apps n the store.
Pro Exclusives
The Amazon Appstore gets exclusives from time to time such as The Wolf Among Us or République. Though some of the exclusives are also tied to their own hardware such as the HDX. Not only is this a good incentive to purchase Amazon Android devices, but it also shows a commitment to feature hardcore games on their app store.
Pro Curated selection of apps
Unlike the Google Play Store where anyone can publish anything they like, the Amazon Appstore has a review process before an app is allowed to be published to the store. This means everything is curated and supposedly is guaranteed to work as well as safe to use.
Pro Download apks that can't be downloaded from Google Play
Such include the limited apps video downloader and mp3 downloader.
Pro Direct downloads on website
The site offers direct downloads on the site itself, though they are a little difficult to find.
Pro Apps not carried on Google Play
This includes mods, module apps, region locked apps, and pre-registered games.
Pro APK downloader app
Using AIO, you can download limited apps and videos .
Pro Can provide apk files when the pre-register app came to be released
One of the first of its kind to provide apk files when the pre-register app came to be released. Such include Pokemon Go and Super Mario Run.
Pro Detailed permissions
DownloadAtoZ lists all the permission of the apk file to let you know which permissions on your phone will be used.
Pro Safe to download
AIO check every apk file first and compare it's signature to the original one to make sure it hasn't been modified.
Cons
Con Fewer apps than Google Play Store
There are far fewer apps on the Amazon Appstore than the Google Play Store. The apps that are available on Amazon are also slower to get updates, in part due to the store not being as popular as well as the verification process Amazon uses to ensure the apps are of quality and are not spyware.
Con Cumbersome developer interface
Previous APK is carried over when updating which can lead to errors if you change the signing keys. Screenshots also have to be a specific resolution
Con Apps can not be used if store is uninstalled
Any app installed from the Amazon Appstore will not work if the Amazon Appstore itself is uninstalled. this is basically a DRM system where in any app from the store will not work if the store is not installed.