The answer to Your question might be as many as there are sailors.
There are a lot of factors to concidder:
The price You are willing to pay
The use of the boat(racing, cruising, daysailing, 'round the world', 'motorsailor'.)
The gearbox type (some boxes need to be locked in reverse, some may be allowed trailing)
Availability on Your 'local' market.
Your priority of speed by engine, by sail, maneuvering, reversing, prop noise and comfort.
Easiness of attaching and servicing.
Im happy with my Flex-O-Fold 3 blade on my 37 Jeanneau.