Bd223, you're right, the 7B-SST's run cooler than the 14B-SST.... I think Mordante is confusing the previous 14B-*ST* as being better than the previous 7B-*ST* monos... the 14B-ST was the first of the amps that used the technology used in the current SST series amps; the technology was subsequently transferred to the entire line-up and rebranded SST (Super Stuart Taylor).
As for the pass vs. bryston question, this is a function of system synergy and the user's listening preferences. I've never had B&W so can't say. Try to audition both and to see which one you prefer. They're both good products backed by great people.