Where do you have each on your board? And you using a VTBass as well?
I have them next to each other. I had a VT Bass V1, but I replaced it with the SFT. Smaller fotoprint and the sound did it more for me, but that's subjective...
Like apples and oranges. COmpletely different types of dirt. The B3K is a modern, cutting, sharp attack, biting modern sound. The SFT is a vintage "wooly attack" type of OD