It really depends on where you live, the area isn't very big (miles wise) but you can spend alot of time in traffic.
That being said.
Ground Control is in Baltimore.
Lloyd Irvin is in Camp Springs.
Evolve is in Gaithersburg.
Yamasaki is in Rockville.
If you are just starting out any of these places is good, I would pick the one that is closest to you. No reason for a beginner to spend over an hour sitting in traffic to attend classes. Just my opinion though.
Look at me, jerking off in the shower... This will be the high point of my day; it's all downhill from here.