I've heard this a lot, but I honestly can't think of anything I use on my iPad that isn't built-in. I say more or less the same thing about my Nexus 7, aside from stuff like game emulators which are verboten on iOS (and, truthfully, I don't use them that often).
The main reason I bought an iPad was... the musical apps (and the fact you can read ebooks with the Kindle app).
The iPad is a revolution in the musical scene.
Musical apps is something you won't get in the Android Eco-system basically because the OS itself sucks at it(although 4.1 seems to have improved a bit on that side).
With this in mind(musical apps), I will always favor the iPad (mini) over an Android tablet.
That's interesting. I found them largely useless, Lemur and TouchOSC aside (Android has TouchOSC support, though I do keep the iPad around if I want to use Lemur--haven't for a while though), but it's cool to see that they're useful for somebody.
I like Auria, Amplitube,BeatMaker2,iMS20,iSequence,DM1,Animoog,Soundprism and the likes very much.
with audiobus on its way, it is going to get even more interesting.
Been using them for lives & recording demos (iPad+MiC+Jam).
the iPad never crashes(not like Android that freezes a lot).
Obviously you do no get a full pc stack and the quality is still not there so I resort to the Mac for more functionality/sound treatment but you can enjoy quite very much if you can't afford the thousands that cost Native Instruments softs or real hardware synths/drum machines.
Strongly disagree, iOS is horribly limiting. I like having OSMAnd navigation with frequently updated offline vector maps and I like having access to hardware capabilities for stuff like this: http://forum.xda-developers.com/showthread.php?t=1914699
Also (IMO) latest versions of Android wipe the floor with iOS when it comes to user experience and options. And N7 is quad core with Tegra, superb build quality and larger resolution for less money.
There are plenty of great iPad specific apps.