I think the bridge pickup adds a lot to the range of sounds you can get out of it, so I definitely would prefer an SB-2 to an SB-1.
I've had an SB-2 for five years, and have come around to this view. I did add a tone control to mine, and it's worthwhile, but I think the bridge pickup is more useful on these. It's cool to add that growly edge to the monstrous MFD split-coil tone; it just kills in a band mix. Some P/J's don't work all that well IMO, but these pickups were designed to work together, and they do. The single coil hum usually isn't too bad.