I don't know if I would say they are THE best beut definitely one of the best. I just switched from 2 Brothers M7 V.A.L.E. to the HMF 2010 Competition Series... I couldn't believe the difference in power.
Oh I agree with you, they are one of the top 3 for sure... There are so many variables when it comes to power gains. In my experience FMF produces killer bottom to mid range, HMF gives awesome gains from mid to top end.