Increased compression is always going to give you more bang for your buck. In every sence of the phrase. If you are just a trail rider and never really have your quad under load you are not going to feel the difference. But if you live in the dunes, you will find that you are going to get through the sand with much less effort and climb hills at a higher RPM or higher gear.
Now, for the real nitty gritty. I ran the RWR cp 11.5-1 piston and it was a good increase, not a bad way to go. But I then went from that to Mr Horsepower's gen 6 lightweight JE piston. Now there was not more power that I could feel, but my bike revved out way faster. I could get up to those speeds much faster then previously. All things being tested on my bike, both my dad's and my brother's bike went to gen 6 pistons because of the power and rev speed difference.
That is my .02
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