FWIW, my experience with the Team Pro and the Swift is that, for whatever reason, they are not comfortable for me. I owned both but have sold them because they just didn't work for me.

The B17 is the only Brooks that's comforable to me, that I've tried, and it's not just comfortable but it's my favorite saddle for a bike that has the saddle somewhere close to level with the top of the handlebar. I've owned several of them, having started riding the B17 quite a long time ago. Works GREAT for me.

But I gave up on the racier Brooks saddles I owned on race bikes; the right modern saddle is more comfortable to me, and as a bonus weighs maybe less than half what the Brooks does. I've not ridden a Brooks Swallow, so I can't comment on that one. It's different enough that I might have completely different results with it than I did with the Swift and Team Pro, who knows.

One thing's for sure, saddle choice is a very personal thing; the folks I sold the Team Pro to and the Swift to find them to be extremely comfortable.