I think it really depends on what kind of an experience you want. I've been to both BOG and CRT and they are both fun, but in very different ways. I think it largely comes down to whether you want characters (CRT), alcohol (BOG), atmosphere (CRT or BOG, depending on where you're seated), or food (tie).
CRT has princesses at all three meals. At BOG you can meet the Beast at dinner after your meal. He's usually there, but it's not a character meal per se so there is no guarantees that he'll be there that night.
BOG serves wines and beers, which you cannot get at CRT. This isn't something that matters for my family, but if you want a glass of wine to celebrate your birthday, you're only choice in the MK is BOG.
Atmosphere is kind of a mixed bag. At CRT, you're eating inside Cinderella's castle! Everything about it seems to say "Disney" to me. Plus, kids get a toy wand or sword (adults too if you ask) and a wishing star. I haven't noticed it being all that loud (at least not any louder than BOG). BOG can be great or mediocre depending where you're seated. The West Wing is an amazingly themed room and really reminds you of the movie. The Ballroom is okay, but it's so big that it reminds me of eating in a convention center dining hall/banquet room. There are elements that invoke the movie, but not enough to really make me think of the movie when I was dining in there. So, for atmosphere, CRT and BOG are equal if you get the West Wing, otherwise, I think CRT has a stronger "Disney" atmosphere.
In terms of food, I would give BOG the slight edge, but CRT as pretty good too. Neither place really wowed me (I actually liked BOG lunch better than dinner), so they're pretty much on par.
So, in the end, I think it comes down to whether you want to eat in the Castle or whether you're a big fan of Beauty and the Beast. I don't think you can go wrong with either choice.