An acquaintance of mine was selling his Fractal AX8. I borrowed and auditioned it overnight at a friend's house, a studio owner, using his Helix floorboard and Kemper toaster to compare. It was super validating to me as a Kemper owner, and it reaffirmed in my mind how heads-and-tails ahead of the industry the Kemper DNA still is.
This is super anecdotal, and I don't wish to crap on other platforms. But I thought I'd share my experience for anyone else who's seeking greener grass. I had gotten a bug in my ear that Fractals were better for metal gains, so I wanted to see for myself. High gain is definitely the Fractal's strength, in my limited experience, but even so, almost each of the 160+ patches on the unit fell flat for me. We went from struggling to find patches we liked enough to modify on the Fractal to kind of digging a few on the Helix. Then I said, "let's fire up the Kemper for a final comparison." And holy smokes. The bawls. The depth. The dimension. The sense of listening to a miked amp from the control room. And that was just cruising through Cloud presets.
In conclusion, though I'll admit that high-gain Kemper patches still leave me wanting, I can say from my limited experience that they're still by far the best out of the three major platforms. And that's to say nothing of the verge-of-breakup gristle tones that the Kemper does so well, and by which so many other modelers fall flat.