do you like your pistons hard or soft? ;)

No but really. What are the advantages of having a one piece hard piston over a soft one with a rubber head? And can anyone attest to the quality of a PDI hard piston for type 96? the only review on airsoft atlanta says that they are terrible and I dont want to base my decision on one person's bad experience.

This whole post is based on the fact that I realized I could literally see around my piston into my cylinder, so Im looking for a higher quality one with a better seal. I currently have an Angel Custom piston and the accompanying piston head from evike in my gun.