Of those pads the 5 star and the Clasic Equine are the best. The Pro choice are nice but I find them move around too much.
When it comes to saddle pads you get what you pay for so do not skimp or think a cheap pad will do.
Also have Classic Equine - it was the only one at the time we could find short enough for my compact mare. I like that too.
OP - as far as thickness - it depends on how your saddle fits. Too thick and it could cause pinching or pressure points.