This is an extremely hard one to choose. I tend to group battles together, evaluating lightsaber battles different from ship to ship battles, for example. I guess I'm more partial to lightsaber battles than the others, so I'll have to choose from one of them. The two that come to mind that I really liked was the battle between Luke, Luuke, Mara, and C'baoth in The Last Command, and the one with Corran and the Yuuzhan Vong in Onslaught. I also liked the one in Vision of the Future where Luke and Mara have to fight back to back in Thrawn's clone room. If I have to choose just one of those, I guess it'd be the one with Corran and the Yuuzhan Vong. It had slightly more emotional impact on me than the others.