BlackBerry APK questions from current iPhone 5 user

Hello everyone,

I'm using an iPhone 5 and would have never dreamt of getting a Blackberry until I saw that those guys could use Android apps now. Neat!

What I'm wondering is if they have the same access to the file system as they would in Android.
I download a lot of free, public domain music via Torrent on my computer, and I was wondering if I could do the same via an Android torrent client on Blackberry.

The second app is a Gameboy Advanced emulator. Could anyone check for me if that runs well on a Blackberry? They way I understand it is that the Blackberry emulates Android, which then emulates a GBA, which has to be a big strain on the processor and battery, right?

The Q10 seems to have all the features I'm missing in my iPhone (proper keyboard, expandable storage, removable battery...), but is it the 'best' Blackberry one can get right now?

Cheers!

i think most of your basis is covered except for the "best" device as that is debateable