Well, one is an APC, and the other seems to be a Master Airscrew. You could have told us the brand names, the prop shape gives it away.

APC makes a very efficient prop that works great on almost any engine. The MA prop tends to flex a lot and wastes a lot of engine power. I've used APC props on all my small (under .90) engines for many, many years, and I'll never go back to anything else.

Dr.1