No comparison I'm afraid, but I have used the K&K phono stage for nearly 10 years. Not only is it the best stage I have used, but Kevin provides regular updates, supplying parts and schematics at only a bit above cost.
I don’t know how they compare in sound, but the K & K is certainly priced lower. At least the model I looked at on the K & K site was---the basic, mm model (all that my pickup requires---it's output is 5mV !). I’m very curious about it myself.