BMT has the ARB Commercial bullbar, which is specifically designed for the 8274. The mounting area is different for the upright design.
CDN,
A winch mounts on a "normal" ARB by bolting the "bottom" of the winch to the front of the bullbar, so the winch does indeed sit, more or less, between the framerails.
Most winch manufacturers use the same "footprint" for the mounting bolts of winches, so for instance a Warn should fit where a Ramsey or Milemarker would, and vice versa.
As for which winch is better, that's a matter of opinion and everyone will have different tastes. FWIW my Ramsey 8000 Rep has been on 4 vehicles and has never let me down. That being said, I only occasionally use it for light recovery work. I believe those who really use their winches around here will most likely vote for a Warn, as the line speeds and reliablity are greater and proven, respectively.
Bottom line on winches....depends on what you are using it for.
I'll see if I can grab a pic and post it for you manana.
-H-