I've always used a combo---usually 2 wool saddle blankets. Really haven't had much use for actual pads. I've tried neoprene and not really liked them (although it's the only one that keeps my Aussie in place). I've tried felt--hated it. Tried a Prof Choice, didn't work out for my horse at all, returned it.
Most recently, I decided to buy a Cutter Classic. Don't even remember what made me spend that kind of money on a pad---maybe the fact that I've ordered a new saddle and I felt like throwing more money around? Haha, lol. Anyway, I love, love, love it. I've bought another one now too! My QH mare seems to just move out so much better--why didn't I do this years ago??