It depends on what your application is. Both Minn and I prefer to use Graupner props, but the are a little bit harder to get ahold of since Tower, Horizon, and most LHS's don't carry them, they have to usually be special ordered.

If I can't get Graupner props my next choice is usually APC props. Now I say usually because there are times that an APC, or a Graupner, just don't "look" right on the plane. In those cases I will usually use a Master Airscrew. Two examples here are my Hog Bipe and my Slow Poke.

Wood props are usually better than plastic/nylon/fiber filled because they don't flex nearly as much. But the down side is that if you even think about touching the prop to the ground with the engine running you can kiss the prop goodbye as it will shatter.

Hope this helps

Ken