Not even close...
Google play = 1.3 millions apps
Amazon = 240k apps
Amazon missing many of the big name apps, and many other apps are several version behind. Many don't work properly on Blackberry either. The comparison isn't even close.
The Amazon app store is almost as crappy as Blackberry's own app store.
The Amazon app store has apps for which the developer has given her explicit permission to distribute, and it should not contain altered versions.
There are other sources with a lot more free apps that they get from Google Play, but I don't use them. What is use occasionally is the own developer's website when the app is not in Amazon and they provide an .apk for direct download.
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