Cyborg. She has loads of power, good direct hits with all limbs, and good aggression.
Carano. Decent power, but tends to swing a bit wide. She doesn't have the 'eye of the tiger', IMHO.
Both don't have the greatest ground game.
Looking at the training vids: Gina seems to be working on cardio. Cyborg is doing burst strength and some cardio.
Best strategy for Carano: Wear Cyborg out, then finish her. The ONLY thing that'd work short of decision. You do not have the power or will to knock Cyborg out.
Best for Cyborg: Dominate and smash Carano out quickly, nip all hope of resistance in the bud. Do not try to keep up with Carano on the running around the ring. You will lose.
Unfortunately, I think that politics is going to play a big part in this. I've also seen the possibility of a loss to pump up a rematch.
Hope I made some kind of sense.