I can fly the same in a heli with either.. keyboard / mouse I prefer for accuracy but it's a lazier experience with a controller ... I have better rounds on the keyboard but I also get "burned up" quicker it's constant correction and key taps , constant ... You also have actually leverage the travel of your switched keyboard for smooth movement of which I never do in a tank or on foot (although I prob should) ...
I'm also into flight sims and I fly model aircraft as my summer hobby with emphasis on helicopters , the mechanics of flight in BF4 for helis is identical to that of a heli in real life so for me it's second nature.
I spend a couple hours a week in the spring / summer on a RC flight simulator, the helis are harder to fly than the BF4 helis, I use my flight simulator controller which is identical to that of a RC Radio controller..
Jets, not so much I can fly them but I'm no good, but I don't have any interest in spending time on them yet, I'm sure at some point I will turn my attention to them...maybe.. but then you have to put up with being called a "Flying Vagina " ...lol...