Helix compared to Roland VG99 in Helix Posted July 26, 2017 I have both. It's kind of an apples to pineapples comparison IMO. VG99 does guitar modeling. HX does not. VG99 does polyphonic synth sounds. HX does not. If you're looking at amp/cab/FX modeling, I'd say that HX wins across the board. For my purposes, HX is the bomb. I don't do much with the VG99, particularly since my GP10 does the bulk of what I want out of the VG.