Personally, I really like the saddles with springs. I have leather saddles with springs and without and the springer saddles are the most comfortable by far. Unfortunately, the neither the B17 nor the B68 have springs.

The saddles with the wider shovel like the Brooks B68 are very comfortable. Many people who do not like the ride of the B17 DO like the ride of the B68 because the B68 has more area of butt support.

Also, I think the flatter top of the B68 is more comfortable for a lot of people than the B17.