Five0addict is the only one who came up with a reason. I personally havn't ridden the REEG setup, but I've sat on it. I've ridden a BBR super pro frame though.
The super pro frame is way to soft box stock and you'll need to play with the compression adjustment and even the spring rate maybe.
Reegs has 2 inches more travel then BBR's, but they dont make there frame, Billetware does.
BBR's frame is all aluminum. Reegs frame is chormoly.
You can get them both in +1 inch.
I met Duane Brown and all of the BBR riders at this passed washington race, and I met Kim Reeg, owner of Reeg there too. They were both really cool people, sure BBR is a bigger name and stuff like that, I suggest either of them.
What forks are you going to be running on this setup.