Probably not as much of an advantage in terms of bulk as Croc is used to- this Batman is actually a bit taller than Croc, and retains the muscles-on-his-muscles build. On the other hand, it's a case of fur versus scales- an attack from Killer Croc is probably going to hit harder than one from the Batman.

Which is why it's so vital that he doesn't let Croc get a hit on him. Batman takes another side-step, away from Croc's swipe, only to find himself slipping in the mud. Batman flaps his wings, letting out a quiet hiss, automatically moving to right himself.