I'd buy a Kemper 2. The past 10 years analog to digital and digital to analog chips have gotten better. Using the latest and greatest chip sets would only improve the tone capture and playing tone. I did a shootout recently with some mid grade audio interfaces released recently and they sounded better to my ears than my dedicated $2000 ADDA units released 10 to 15 years ago. The new interfaces sound clearer and have more detail.
Also faster modern processing would allow the use of better and more complex captures of the amplifiers. There's a tradeoff between accuracy of an algorithm and latency of the algorithm creating the tone for the player. If the algorithm is 100% accurate but takes 1 second to to create it is unusable for a player. Approximations, simplifications and filters are needed to get the modeling done fast enough to keep the latency down. It's amazing what the Kemper can do with such little latency as is.
I think my Kemper and Kone combination sounds really great but if you watch the recently posted YouTube videos comparing the real amps with the Quad Cortex and the Kemper, the real thing seems to win out to my ears especially with the clean tones.