The only time I really tested 3 bladers much was on my CL stunt models as we were always looking for ways to get constant speed. Same descent speed in downlines as uplines. The idea was the more blades would provide braking action because of more drag of the xtra blade. I never liked how they handled otherwise though. So I moved on.

The aircraft design, and objectives are important factors. But you will see very few multi blades in use, other than on warbirds. Performance aircraft tend to stick with 2 blades, and the speed guys use single blades.

These are just ideas to nibble on. Your milage may vary