With my saddle fitting customers I'll work with them if that's what they have but I'd never recommend them if starting out and spending money. What is the issue you're trying to solve? I'm a big fan of a therapeutic pad for most horses but I like sheepskin, and then the materials that have publicly available testing results so you can see what you're getting. Prosorb, Prolite, Equitex etc all keep quiet about the actual material so you can't look it up.
I recommend a shim pad wherever funds allow as you never know when the shims might come in useful (never get riser pads, a shim pad can do it all), Mattes for sheepskin pads, and Invictus for hi tech shock absorbing (brilliant pads). The big brands can't compete imo.
On basic testing (dropping a bowling ball onto the pad on concrete) sheepskin reduces bounce as much as Prolite, I've not tested Prosorb but would bet it's similar. Why not have the benefits of sheepskin (sweat wicking and pressure spreading) too...
I have a benetton blue pro sorb with the shims and I also have the lambskin pro sorb half pad for when I want to change saddle pads. The lambskin is so comfortable ?