Of the two, I'd lean toward Modern Essentials for the type of sound I prefer. I play mostly 80s Metallica type stuff, so that's the general tone I'm after. I enjoy the Soldano and Frideman presets mainly, the others don't do a lot for me.
For reference, in my Glenn presets, I almost always gravitate toward the Splawn S Comp from his High Gain collection. That one preset basically made the Helix really work for me.