I feel ya.
Best is subjective though.
Hyperco has been universally praised by everyone here, and rightly so. There is a lot of information to be had here due to the experiences of many forum members.
RM's have had about a month to make an impact and its been a slow one because of how long and drawn out the design/production process has been.
Lots of members have attempted to draw a comparison between these springs based on the #'s... differences in spring rates, as well as the progressive vs. linear characteristics, but to the best of my knowledge there hasnt been a real world comparison between the 2.
All i'm saying is that we need more info before we start throwing around terms like "best".
One thing is for sure though, both of these options have been designed correctly around our specific chassis' and thus are among the best choices we have in aftermarket springs. Good luck in your search to find the right setup for your ride.
