Oh god, had to happen. All right, I'll bite. Yamato's wave motion gun is pretty bloody powerful, but it's hard to imagine her defeating an 11-mile-long Executor-class command ship.
However she does have endless self-repair capacity, so the command ship couldn't defeat her, either. I call stalemate.
For me, the real question is this: will we get a new 1/350 kit, with all the more realistic live-action movie detail?
Stalemate?! A well crashed A-fighter took down one of those babies - the wave motion gun would melt a super star destroyer in half like butter.