Whenever its legal I pretty much always go Congo Jungle, though thats probably more of a personal taste. Though its harder to kill off the top, and there are more recovery options available because of barrels making it pretty hard to kill peach there. Also a lot of people aren't quite used to the dip on the main stage, so you may have an easier time landing a stray Fair for the kill.
Duck Hunt is pretty good I feel. There's a lot of space to move around and trees to escape to if you're pressured on the ground. Also when you're up there you can try to cheese someone out with the parasol if they mis-space an aerial.
Though I seldom go on other stages besides Smashville, FD and Battlefield. I tend to ban Lylat, though I'm not sure if its as bad as I think it is for peach. Also I tend to ban halberd. The ceiling is super low there, and most of the higher tier characters don't really have a problem killing off the top, though peach can also try to get a cheesy parasol kill.