From another thread, in which this question was asked of someone else :
[quote name='andydye' timestamp='1347728042' post='1804412']
How would you describe the differences and similarities between the [BB and SFT] as they're both on my 'try list'?
[/quote]
BB:
nice, but non-commital style of distortion - a bit plummy and with a bit of grind in there too.
has post gain tone controls so you can brighten or warm your sound.
Has quite an open, 'hi-fi' sound, but can sound a little brittle used straight into a recording / PA.
SFT:
has a bit of an inherant snorty, throaty sound, perhaps like a speaker sim.
pre-gain bandaxall tone stack - so the tone controls alter the gain / qualty of distortion, rather than simply change the tonal balance. I like to push the treble much more than the bass, or you just get plummy bloom and no grit. You won't get much added bass out of the SFT.
Quite touch-sensitive and responsive.
Can be driven at 18v and some reckon it's better there.
Both have similar gain ranges.
I'll venture that the BB is probably better if you want to add a bit of dirt to an amp you already like, while the SFT sounds more 'like a record' and is great fun to play through a PA or clean amp/cab due to its touch sensitivity and 'ampiness' (and I say this despite having found its basic sound a bit thin and middy)