Vortech Mp40?

[Slyguy00]

So I have a 50 gallon bowfront tank with two fluval sea 740 kph power heads. Although they do create more than enough current in the tank its not very controllable and is pretty constant. My question is this, what are the best power heads on the market and why? all my research leads to the vortech mp40 or mp10. If that is the general consensus would i need a mp40 for a 50 gallon? any input would be appreciated.