A werewolf could potentially experiment with different fighting styles to see which can be incorporated into his gestalt form, but I think most werewolves would put more of their effort into maintaining a sense of anonymity. Werewolves could be fast and agile, but I'm having a hard time picturing one of them getting a good kick in anywhere above their opponent's knees, so the only fighting styles among humans that would work would be boxing and wrestling (and not the kind you see on
Summer Slam), only with claw swipes substituted of punches, at least assuming werewolves can't make a proper fist. Werewolves are predominantly human, so they might be less likely to resort to biting.
That said, it really depends on who their fighting.
In the case of a human, a werewolf's first priority would be disarming him. Once that is accomplished, he wouldn't use much effort either way. If he wanted the human alive, all he'd need to do is either pick him up or pin him down, which his larger form would allow him to do in a multidude of ways (did your dad ever do
this to you?). And if he wanted to kill the human, he could give him one claw through the neck to simulate a stabbing weapon, or avoid any telltale evidence altogether by snapping his neck... Or I suppose if he had a strong stomach, he could kill him however he wanted and just drag him elsewhere to, um... *ahem* "Dispose" of the evidence.
As for a pair of werewolves fighting... That's a tough one.
If both werewolves wanted each other alive, they would probably be more brutal than in their dealings with humans, but it would still only end once one has the other in a position where it can't move. They could probably attempt to pound the other into submission, but werewolves are most likely too tolerant to pain to give in to something like that.
And if they wanted to kill each other... They'd probably all have their own techniques, but they wouldn't be very professional and the only thing they would all share is that they would best guard their neck and chest.