On the iPad, everything I run has to be vetted by Apple. That means nothing that competes with them in ways they don't like, as well as very little open source software. On the Nexus 7, there are multiple app stores; I have used two. First there's the Amazon App Store, which gives me access to their Free App Of The Day and their full catalog for the Kindle Fire. The other is F-Droid, a library of free and open source software that lets me see which apps protect my privacy and software freedoms. Not only do I have all the apps I have ever needed, but also I know that none of my suppliers can lock me in and their competitors out.