What's the best hammer configuration to use for GMod mapping?

I want to make a build map for my server, but I don’t use hammer often. What engine/game will make my life the easiest while using hammer? I know that OB engine allows loading of portal files, which is nice to have.

Episode 2.

Everyone should have it by now.

Alright, now I just have to finish the DL :arghfist::v:

Too bad my comp can’t support ep2 particles in Gmod :argh:

Does it support it in ep2? If it does, then you might want to check your mounts.