If you are a lover of a good cold beer ( or other "adult spirits" ) than the pub at Rose & Crown is not to be missed, and you should arrive a good hour before your ADR.
As for the food, well... It's kind of apples and oranges. I'd say the quality is about the same level at both locations. Just take a look at the menus and decide what sounds best to you and yours.
It's been our experience that the CM's at Rose & Crown are consistently some of the most helpful, friendliest and colorful characters in all of Epcot.