Here's a quick comparison video between the Neo Instruments Mini Vent, Strymon Mobius and Fractal Audio Axe Fx II. Rotaries are played clean and with drive on in mono and stereo. Hope this helps to choose between rotaries. ;)
Here's also a rectification of the stereo rotary block of the Axe Fx II. A new audio recording using Simeon suggested settings (low depth 21%, high depth 40%, rotor length 80%, LF spacing 0%, HF spacing 50%, drive 6). The second part has the drive set higher to 8.9.