Hi Jim,
I sold the sailboat three years ago and seriously wanted a GB32. I also looked at a lot of CHB34's. I ended up with a Defever 34, which I jokingly refer to as a dry GB32 with elbow room.
The GB's start as a much higher quality boat than the CHB. The CHB's offer a lot of value for the money. Around here a lot of the CHB's have a problem with stringer rot and soft decks That might be less of a problem in San Diego. Both boats are likely to have similar engines (Lehman).
One problem to watch for on GB's is rusty fuel tanks. Deck leaks will allow water to rest on the top of the tanks. This might also be true of the CHB's (I don't remember).
A CHB will have quite a bit more room than the GB. The two extra feet makes quite a difference. One of the biggest problems with the GB's is they're a wet boat. There's no flare in the bow.