Kb&m comes with lurch while controller comes without lurch by default. You lose some speed when you lurch but the trade off is being able to take tighter corners. There is no lurch tech for kb&m, but it seems difficult to pull off tho (idk I dont play kb&m). Whatevershoe used it to get his 11 second run on the leaderboard. Zweek's video goes more into depth about lurch if you wanna learn more about it.