Two for go, three for show as the old saying goes, though it doesn't really tell the whole story.
Three bladers are generally a bit quieter and can give better acceleration however two bladers generally give a faster cruise speed.
More blades are generally used to give better ground clearance and or to absorb more power where it isn't practical to run a two blade prop.
Interesting Piper had to increase the power on the PA31-310 to 325 when they installed the CR engines in order to get the same cruise speed. Non CR aircraft are faster for the same horsepower than CR aircraft.