I'd say overall, Chef Mickey's...the characters have been good in my experience...I love the PARTY part!...the food is good...the desserts are delicious!! AND you can't beat that Contemporary-monorails-rushing-through atmosphere!
I'd say the character interaction varies on different days...I don't think there's one meal that has consistently better character interaction unless it's b/c of something like the party at Chef Mickey's, etc. For instance, once we had a REALLY good Chip and Goofy at Cape May Cafe (Chip wrote a hilarious passage in my diary...and Goofy kept stealing my brother's hat!), but the next time we went, the characters were kinda blah!