A search would yeild faster results that I can type them.......but in short......higher compression of the N/A pistons would give you better response, better off boost power, and a little more over all power with the added beneffit of incresed thermal efficiency. What's the trade off?.......higher compression limits the maximum amout of boost you can run. With all other factors being the same you can run more boost on lower compression piston than higher compression pistons. Assuming the rest of the engine is up to the task... Your fuel quality, intercooler efficiency (air density) and the specific settings of the fuel and ignition curves will govern the maximum amout of power you can make on either set up.