moo2t...I figure cause i've used it for both. Driving it on the road course, you're not doing things that intentionally upset the cars handeling. When I would hit the proper slip angle through a turn the car felt natural and predictable. Now when doing more aggressive\intentional drifting at the last drift day, the car felt very unpredictable after the rear end got to a certain point.
however like all things, you have to take into account....Tires, camber, caster, tire pressure, track temp, how the cars running, familiarity with the car\track...all that stuff.
Is the welded diff better than open diff for drifting...heck yeah. Would I take a welded diff over a 2 way clutch...nope, but thats just me.