Neither is bad, but to my ears Eleven rack sounds darker with fewer harmonics/presence. Pretty much my assessment when comparing against the AX8.

Ultimatly we are not comparing apples to apples, the technology in Helix/AX8 compared to the Eleven rack is several ticks ahead. It's like comparing an original Quad Core CPU with the current versions...IMHO

Oh and congrats on NGD!!:D
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I'm a practicing guitarist, one day I hope to get it right..