Pick up worse, really? I wouldn't even be sure a flat faced bat would be better aerodynamically than a round faced one, the back of the bat will be much more significant than the front. (and even then will make sod all difference!)
Contact will feel a bit cleaner off-centre with a rounder face as the ball is glancing off slightly rather than spanking straight into a flat face, which can help you out a bit at times. Personally feel like it's a little easier to manoeuvre the ball about with a round face, a little easier to hit dead straight with a flat one.
To be honest the biggest difference is flat faced bats are much more susceptible to edge damage, more knocking in time required if the edges are dead square.