I haven't used a PI but I've read good things about it and am considering getting one even though I don't need it!!
My experience with an Android device was a really bad one. I got some G-Box Dyno sticks and they're useless even though the specs are good. My advice is:
Reviews on here are your friend, Reviews on YouTube or vendor websites are your enemy.... Mortal enemy, those reviews want to kill you and your family type enemy!!!