We've done Goofy's Kitchen buffet for brunch and Storytellers for breakfast, off the menu.
Food was great at both places. Storytellers can be less expensive because you don't have to do the buffet - even though my friend was told by a cast member that it's cheaper to do the buffet than to order off the menu. ???
I think the question is which characters are you more wanting to see?
Storytellers - chip n dale, brother bears, meeka & the ape from Tarzan (when we were there)
Goofy's - have seen Jasmine, aladdin, genie, belle, goofy, pluto, donald, mad hatter, alice, rafiki and maybe some others, too.