Far too many people believe that because of the changeable gullet system, air panels, etc.. that the saddles are an end all be all for any horse and can be made to fit anything, when in fact this is far from the truth. Like any saddle they must be correctly fit to the horse and, like any saddle, they will likely only "work" in about 10% of cases. It is for this reason that I do not like the saddles as they are marketed falsely to the public and in my experience have lead to a lot of horses with bucking problems, behavior issues and severe saddle soreness. Not to mention the synthetic materials used throughout the saddle. I also feel like they actually hinder a classical dressage position and instead force the rider to adopt a concave backed stance on the horse and for myself in particular have caused pain issues in the lower back and knees unless the saddle is 2-3 sizes too large for the rider.
While yes, they can be a great saddle, IMO a "natural" material saddle is going to give the horse and rider a better feel, conform to the shape of a horse better and last longer in better condition. As well a leather saddle will generally be produced less by machine and more by hand, providing a higher standard of quality in general. A Wintec might work for your horse, but I've not seen a horse in person that the saddle has worked for. Lots of bouncing cantles, panels and popped air sacks, and the need to replace the saddle every few years due to "parts failure".
They say money doesn't buy happiness -- well happiness doesn't buy horses!