Well I don't think you will really NEED the suede, they brought it in because the fake leather used to be awfully slippery and they wanted to give riders another option. The fake leather is quite grippy now, on par with nice leather IMO. And they have made the suede more and more grippy over time, I swear! I have an older Wintec Pro that is absolutely lovely but because I show it's not pretty enough... that didn't kill the full seat jodhpurs I wore when I rode in it regularly. My current dressage saddle, on the other hand, absolutely would. And I have a friend who has a newish Wintec Pro dressage that has big white balls of fluff on it off her full seat joddies, and the suede is wearing off :/
Moral of the story, if you're going to use suede, don't use full seat joddies. :P
I'm always happy to help, feel free to PM me if you want. I have a million saddles I don't use so I have opinions on most Wintec models!