We have a great fitter in our area who was willing and able to leave demo saddles with us (and friends who were also in the market) for weeks on trial. After all of this fitting and extensive demo-ing, we ended up scoring a virtually new saddle through her (she didn’t personally have it; Stubben informed her about a demo sale, she called them on our behalf and Stubben pulled the saddle in question from their warehouse and described it in detail before we ordered), so we didn’t have to order a custom one.
One friend found what she needed through continued on-line searching, and the other had to bite the bullet and finally order a custom after failing to locate either a used or a demo saddle. All of us, and our horses, are happy with our saddles. This was last fall.
My spouse, who I really thought would enjoy the Biomex, after trying various models for extended periods, actually preferred the plain seat. Since we got a demo, we compromised by getting basically the same saddle as the one on trial, but it in a different leather (saved the big bucks, so that’s more than okay).
My friends both preferred the Biomex and everyone liked the monoflaps. Friend who special-ordered ended up changing which Genesis model she wanted after the demo-ing. Seat sizes ended up being slightly different than everyone thought they’d require going into it, too.
So, do you have access to a fitter who could lend you a saddle or two for a while, more than a few days, so you can fine-tune what you want and need?
As for the tree size, we have 32s for our cobby-built horses; friends bought slightly narrower for their baroque and warmblood horses. Stubben also offers a XW.
Best wishes on finding what works for both of you.