I have a 22x20 B/B, and love the sound. With different tunings and different heads, you can get pretty much any sound out of it. However, the B/B is going to be more "boomy" than the maple. The maple with give a very strong and quick punch, with less sustain. Drummers like Chris Adler use maple (although his is maple/walnut, i believe) to get that "punchy get outta the way fast" sound.
Its all personal preference. Bubinga gives the warm deep sustaining tones. Maple gives a more quick punch. As far as loudness, I don't see any difference, my B/B is plenty loud! Plus, if your recording or playing live, you will be mic'd.
Starclassic B/B Harvest Dusk
10x8,12x9,14x12f,16x14f,22x20b,14x5.5s
Paiste Twenty 14" hi-hat
Paiste 2002 16" Crash, Sabian 16" Crash, 22" Ride, and 8"splash, Zildjian China
Eventually will be all Paiste Twenty's