I have the Audio Desk and the KLaudio, both do a great job but to be sure exactly how much they differ, I must do more testing.
My overall impression with only a few days experience and half a dozen LPs, the KLaudio seems to be a bit more effective. By effective I mean the sound is a bit more transparent and background noise and pops are diminished.
Construction of each is good but the KLaudio is industrial strength and quality and after setting it up I understand why it has those super duty handles on each end. Very heavy, very well made and very fine finish.
The KLaudio is louder than the Audio Desk. I can actually hear the water being churned by the ultrasonic action, a high frequency vibration that hints at the power at the heart of the cleaning mechanism.
A couple of LPs I tested had previously been cleaned with VPI 17F, Odyssey RCM (German Keith Monks) and the Audio Desk became quieter after running through the KLaudio.
I also tested a couple of new LPs, fresh out of the jacket with the Audio Desk and KLaudio to see if the results repeated.
Both the clean and dry cycle times are adjustable on the KLaudio and when it's complete there is absolutely no trace of moisture. In fact the dry cycle can be run by itself, so if you clean an LP with the Audio Desk and it comes out with drips, you can run it through the KLaudio dry phase and it comes out spotless.
I'll likely have a stronger opinion after more LPs are cleaned but I think the Audio Desk and KLaudio are the best record cleaning machines on the market.