What do you want to do with the horse? The discipline/job you select will set the base design(s) of saddles and other tack.
I've ridden Walkers in Western, Aussie, miltary, English, English endurance, and dressage saddles. Each worked for a purpose, but not necessarily the purpose I had in mind at the time. For example I went on a four hour trail ride with PWHAT in Middle TN once in a Stubben Tristan dressage saddle. NEVER AGAIN!!!!!
It was one of the most unpleaseant
experiences I've ever had!!!
Personally, I don't like Aussie, McClellan, or English Endurance staddles. They just don't work for me
. Western worked OK but I've moved away from that discipline. I ride a Stubben Scout almost exclusively as it fits in all the things I'm doing (trail riding, equitation, CMSA, military competition, etc.).
Pick your discipline then pick a saddle that fits you
, the horse
, and your use
Good luck in your search.