By far my preference, if the budget is there, are carbon fibre props such as Bolly. The rigidity makes SO much more thrust in varied situations, and acts as an airbrake when you're being silly and doing high-throttle dives or downlines.
Next in line for me is APC for lower noise level and good performance esp at higher speeds.
Sincerely,
Mrs. AnnMarie Cross
Senior Manager, Proprietary Service and Support
Great Planes Model Distributors
[email protected]
www.greatplanes.com
www.bestrc.com