I've found PG Scuff to be a lot like Valentino's Resurrection: they abrade the ball to the 1200-1800 grit range when used by hand, cleaning the ball quite well. When used with pressure and the spinner, they'll take the ball to much finer, depending on your pressure and the time, leaving a finer and possibly lightly polished finish.
Clean and Dull does not not normally abrade the surface without a lot of pressure and time and then much,much less than the above 2. Clean and Dull is the next best thing to a full extraction. In fact, if you use C&D regularly and thoroughly you can postpone an extraction for a long time.
Power Gel Clean is not, in my experience, comparable to the best water-based cleaners, like Remedy, Knock Out, Zapp-It, Vise cleaner & Liquid Nitro.
PG polish is one of the least abrasive polishes on the market. It is really good for rev-dominant bowlers because it allows you to get so many levels of polish, degrees of shine. If you are speed dominant, you need a full shine or a dull ball; then some of the other more abrasive polishes may be a better choice. If you expect to get an immediate high gloss shine with Power Gel, you'd be wrong. It takes a while and at least 2 coats to get a higher degree of shine. As I said, it's strength is that you stop at any point in the process and get small steps of length and control.