Which bluetooth keyboard is the best for Ipad?
Depends? What size do you want, do you prefer one that folds, what features do you desire, do you want it integrated into a case, and other questions, such as price?
As a result, you will be getting a lot of different recommendations, so to continue the ones already suggested, I own the Apple keyboard (does not fold but bought a nice compact case and can carry 'on the road') - wife & I really like the 'feel' and size of that keyboard.
If possible and before your purchase, you may want to visit an Apple store and check out a number of different options - this is somewhat a question of personal preferences; also do some searching on the forum, plenty of threads & posts are already available - good luck in your choice(s) -