We just finished a fun run in these, and the Shifter Kart was definitely more forgiving and fun to drive, with side by said racing possible. The single gear ROTAX was quite snappy and ended up being harder to drive.
Mael did leave early due to feeling motion sickness on a perpetually twisting track. Mael, did you adjust the camera settings? I lowered my camera a bit so I could see some of the steering wheel, and that might help with the feeling of motion sickness.
Overall, the shifter kart was fun to drive and would be good racing in a larger field.