Strong players might overpower them and need a thick wall flute. Conversely, some players find a heavy wall flute too unresponsive for them and lean towards a thinner walled flute. The headjoint can make a difference either way. You've got to experiment and see which works best for you. The foot joint affects the balance of the flute in the hands, the 3rd register, and response of the long tube notes on the flute.
Some flutes even offer a convertable C to B foot to have the best of both worlds.
B foots are perhaps more common today than they used to be. The purpose of this keywork modification is solely for making High E more stable. This venting makes the high E more stable but the addition of keyworks also adds more possibilities for regulation errors. This provides a similar stability while playing high E without the addition of any mechanism. These donut type devices are usually added later.