I own both. Yes, I am insane. Overall, the Helix just cannot even be compared to the AX8. It has a massive amount of features that the AX8 does not including the ability to use the Helix as an audio interface. You cannot use the AX8 as an audio interface. THIS IS HUGE to me. Yes, I think the AX8 has slightly better sounding "stock" models and cab sims out of the box. However, you can tweak the living crap out of all of that on each unit. I don't think I have ever met anyone worth a crap who doesn't EQ guitar tracks when recording.