We are firmly in the "splitting hairs" department when it comes to sound and feel on any of the top tier modelers. I got my Helix to sound 99% the same as my favorite patches on the Axe-Fx 2 (first ARES firmware) when used with the same IRs. The QC is not going to be any different in this department. While Fractal may overall have the most advanced modeling, a lot of their improvements have amounted to very subtle differences that you can spot only when playing it in person. The killer feature of the QC is the UI. That's where modelers still have massive differences. IMO the top dog for hardware UI is Helix right now and Fractal for software editors. QC could take the hardware UI crown if they can get it work smoothly and consistently as the NAMM demos had some issues where things did not activate on first press like they should.