[mulhiny]

That is a tough comparison due to the fact that most peoples usage varies day to day. That's why most people will give you the answer "try them and see what's best for you."
I can tell you that personally MightyROM 3.9 gives me the best battery performance. Battery life is the most important thing to me and this is what I look for first. I also use HTC Home and not TF3D to keep the RAM usage to a minimal.