The B17 Champion Special has thicker leather and bigger rivets than the B17 Standard. The thinner leather on the standard makes it a little more comfortable when It's new because it has more "give". The current production Team Pro is not pre-softened. Like TheOtherGuy, I like the B17 on the bikes I have that I sit more upright on. If my bars are much below seat level, I prefer the Team Pro. I've never tried a Swift.

If you get a chance to buy a Colt, don't.

The Champion Flyer is the most comfortable saddle I've ever tried, but it's heavy. It has the thinner leather and springs that really do smooth out the bumps.

That's my take on the subject.