Chef Mickey's for breakfast (because the food is better, and the character interaction is the same).
Whispering Canyon for dinner (because the food is better, IMHO, and the "character" interaction is amusing..even if they've toned it down a bit).
I wouldn't do Chef Mickey's twice in one trip....because we don't feel the food would be worth it. It's not terrible, but..it's not amazing, either. And once you've hung out with Chef Mickey and the gang once...I think it would lose some luster the second time. "Look kids, there goes Chef Mickey!"
We really liked the food at Whispering Canyon. Not a HUGE fan of the menu change in principal..but we usually did the skillets, anyway...so it probably doesn't change much in practice for us. We still like their desserts (though I did order the jalepeno cheesecake once...and will probably stay away from it in the future), and the overall quality of the food/service. They've toned down the antics, a bit...they're not quite as in your face...but it IS a lot of fun (especially when you ask for ketchup)!