I have played only at Sherwood Forest and well, the only thing I like there is the city/castle and how nice the refs are, their speedball field sucks but its better then nothing.
I like blast camp a lot, I have been playing there ever since I started this sport and I know the field inside out. The refs are very nice most of the time and they pick great games. My favorite is either collision in the messhall or collision on the octagon. But the best thing about that field is the big games like: Summer Paintbrawl and the Citadel. I have to admit that embassy isn't the best one they got but usually people dont like it because they are scared of getting hit by a paintball, but I dont like it because it gives you a lack of space to move around in. But if your just starting paintball or your a expert or whatever then blast camp is the place to be.