Matt,3 blades are a little faster on most boats than a 4 but 4″s handle better and carry a load better on most boats ,you just have to try both and see which one your boat likes better.If you go to the owners page you will see that some of us basscatters are running tempest”s and some trophy”s,i have an a40 23p tempest on my sabre now but i just bought a 23p trophy,will try it this weekend and see what happens,you also might have to re-adjust your jack plate between the two,Brian.