I've used Pro choice and hate them. They break down too quickly for the amount of money. I've had the Classic Equine ESP pad before. I really liked it. Used it for 4 years and it still hasnt broken down. The down fall is that for a horse that's a sweater... like mine... it didnt breath very well. So for him I switched to the OrthoEquine pad. (I guess you guys may know them as the Team Steinhoff pads) They were nice enough to give one to me. I've really liked it so far. The inserts can be removed so that the saddle pad dries quickly and it still has a "memory foam" inserts inside the cloth sleeves. Breathes much better and much easier to take care of.
I've heard a lot of good from the 5 star pads and the Cutter pads. I know Cutter pads last FOREVER but I really dislike them as far as the wool pads. Mine would never dry out as both of my horses are sweaters.