There are a couple of advantages to 3blade props.

They are quieter.
The one that will suit your airplane (if you are lucky enough that there is one made the right size) will have less diameter by a slight amount. And that gives better ground clearance. One additional reason I like the 3blade on the Tiger60 is because our field grass is a problem. That 3blade reduces the amount of grass that is shredded and blown back on the wings. It sticks and is a pain to clean off.

These are not major advantages. But they are worthwhile advantages. Much more worthwhile than the advice of people who say things like "airplanes with 3bladed props stall sooner".