All of the assists have good uses, but the best all-around is probably Lou. use MP to pick him.
Wolverine’s infinite is : s.wp, s.mp, down, s.wp, s.mp etc…
it’s a crouch cancel, and is set-up after a flying screen. The best set-up for it is after the Berserker Barrage X in the corner.
WarMachine has several infinites:
s.wp, s.wk, s.mp (or s.mk), c.fp, b+smart bombs
dash in, repeat. It can be set-up by a lou-assist
j.wp, j.mp, j.u+fp
This infinite isn’t as easy as the IM infinite in MVC2, i usually do it for 2 reps and end it with a s.fk, wardestroyer. It can be set-up by a colossus assist or a kneedive into a u+fk.
He has an air-infinite too, in fly mode
flying: wp, mp, u+fp, dash, repeat
do this for 5 reps, then switch to wp, u+fp for 2 reps, then you activate fly again, and the combo continues. This by far the most useful one.
I usually set it up with this combo : c.wk, c.mp, s.fk /\ sj.wp, sj.wk, sj.u+fp, airdash diagonal up, ad.wp, ad.u+fp, fly, f.wp, f.mp, f.u+fp, dash, repeat for 4 more times, then…f.wp, f.u+fp, dash, f.wp, f.u+fp, then activate fly again cuz that’s when the fly runs out.
You have to learn how to control this infinite while you are in the corner, or else you will dash under him. WM has unfly mode in MVC1 too, and his flight is hella fast. I’m pretty sure that GWM doesn’t have any infinites, but he’s pretty good without them.