Coincidentally, I’ve got both sitting in front of me right now. I’ve also got Helix Native and an Axe I/O from IK Multimedia, so I will include my thoughts about the big three as if I was speaking about the Helix floor (I’ve had the Helix hardware and with a good interface there is no discernible difference between Native and the hardware).
Ive had the Kemper Stage long enough to have chased the “right” profiler for me and have landed on Rhett Shull’s, which captures and EQ profile that my ears like. Spent a few hundred or more in the process but eventually was able to stop. The Kemper Stage sounds and feels fantastic. Effects are high quality and it thumps like an amp should. Foot switching and user interfacing is super easy to get a handle on.
All in all, I really enjoy it. It’s inspiring, fun, looks cool as heck, and met my expectations.
However, it pales in comparison to the FM3 and the Axe Fx III (had one but didn’t need all that power) when it comes to modelling a real amp in the real world. In fact, it pales in comparison to the Helix stuff when it comes to the true nature of amp behaviour.
To know what I mean, load up a Tweed Deluxe model with the IR of your choice. Crank up the input gain as you should with Tweed amps
. Sounds great if that’s your thing. You can get the same thing out of the Kemper once you find the right profile with an EQ curve that suits your ears like I noted before. Next step, throw a boost in front of it a la Neil Young. Check out his recent Le Noise record he did with Lanois to hear what I mean. The Fractal stuff knows what to do when you boost it. It’s been modelled damn near perfectly. The Helix will do this as well, just not as well as the Fractal stuff. The Kemper will not and I actually think it CANNOT do this. It doesn’t know how to.
Take this idea and apply it to every other amp in each of the products and it applies. This is the biggest shortcoming of the Kemper and the strength of the Fractal units. Fractal units have the brains (programming and programmer) of a real amp. Kemper does not.
Add in the price difference, continuing improvement of the actual amp tones through updates, routing capabilities, size, tweakability like a real amp, and you’ve got yourself the clear winner.
That’s my take. Been down the modelling rabbit hole for years and have no doubts that the Fractal ecosystem is the runaway winner.