My vote was for Disney Legends. It may be easiest to focus on the acting side of this, but maybe in the future, we could ALSO rank the real Disney Legends -- the people that Disney has recognized, found at: 
http://disney.go.com/vault/legends/index.html
Regarding Best Cartoon Shorts (without the word "Cartoon" it wouldn't be much of a ranking.... Mickey was about the only character to wear shorts!), this would be a daunting task. It could be simplified into ranking character lineups: Mickey's top 10 shorts, Donald's top 10, Goofy, etc. Even rank miscellaneous shorts (Lambert the Sheepish Lion, etc.) and perhaps allow the freedom to include segments from the likes of Fantasia, Make Mine Music, etc. (Johnny Fedora & Alice Bluebonnet, Once Upon a Wintertime, Johnny Appleseed, Casey @ the Bat....).
Breaking down Shorts by characters would also work, in that, we don't have access to all of Donald's and Pluto's works yet. Meanwhile, we could get to work on MM and Goofy (I know,  we're missing some of the Goof....).
 
			
			
									
						
							My handmade paperweights, including Disney subjects -- some contain viewable movie cells!
http://www.etsy.com/shop/tmhofherr
Currently listed: Ludwig Von Drake, Annette, Zorro, Star Wars, the Wicked Witch, Classic Tron, and more!