My horse has been very sore-backed lately, and I’m pretty sure it’s because of my saddle. I am getting ready to buy a new one, but I also want to buy a saddle pad that can help prevent back pain. What is the best kind (gel, sheepskin, foam, etc.) and what is the best brand? Thanks!
The three main ones that I am looking at are the Wintec Gel Comfort pad, the Traumatech pad, and the Equine Comfort Sheepskin pad with Gel Inserts.

Would I be he same size in a dressage saddle as I am in an English saddle? I’m a 17″.
Would my horse react differently to a dressage saddle since he’s used to English riding?

Thank you!