I do not know about the best TS/CS meals in WDW, but I can say that everywhere we ate, we were very satisfied (although, I do find that the WDW food portions are quite large).
We ate at the following, and found each and everyone great.
Dinner
Boatwright's:- was good, not amazing, but good.
Hollywood and Vine:- was good
Whispering Canyon:- if you have kids you have to go here, food was great, atmosphere was fabulous...servers were very fun!
Boma:- wait to get a table was long, but well worth the wait, the food was awesome, atmosphere was just as good.
Cap'n Jacks:- Service was very good, despite it being very busy, they got us in right away...the food was just okay, not the best!
Breakfast
Ohana Character:- this was the best meal we had, the server was fabulous, the characters were very interactive with the children, the food was plenty and ver delicious....this is a must do!!!!
Our best CS meal was at Epcot in Moroco...it was so delicious. I love CousCous, and the swarmas were very good.
Hope this helps!