20" vs. 24"

I know all the conventional wisdom about 20" wheels being better for stage and
24" wheels being better for commuting, etc., but I am really interested in
buying a new uni and when I look at my performance style, most of what I do are
fancy mounts or idling while juggling. Granted, I usually am on stage or in a
small area, but isn’t it easier to idle on a 24" uni ?

Question #2- My 20" Schwinn is beging to show its age because of my less than
perfect kick-ups and my ill fated desire to do stairs. Is the Myiata the best
for putting up with these rigors or is there another brand as well suited for
this abuse?

Thanks for your comments Karl