I play on PC with Xbox controller and I find it pretty smooth mechanics wise. I think the only time ppl have problems on PS3 is during hunts where there are 100's of people around - which can lag them out.

For this reason alone I say PC is better, but there are some work-arounds for PS3 players too when it comes to lag city central :3 Like having party member mark the target or alternatively doing hunts not during NA prime time. Tbh Hunts during NA prime time sucks on PC too since people are not as nice and are more impatient xD