sword, gun, magic, and hand-to-hand battles
also mecha battles
my all time favorite is the clashing armies though, like the intro to FFXI, and the LotR movies
needless to say, i LOVE the dynasty warriors games
but if they throw a mecha in there, it becomes contrived
mecha should only fight mecha or oversized monster/demon (such as Godzilla vs. Mecha Godzilla, the Dai Guard series, etc.)