Thanks for posting the calculator.I've been looking at both of these as well. On Vortech's website, they have a flow calculator. When putting my tank (14G) into it, the reccomended flow was well out of the MP10's optimal zone. It's too powerful for my small tank. FOr that reason I'm leaning toward and Nero 3.
VorTech Flow Calculator – EcoTech Marine
ecotechmarine.com