Both Great pistols, and in 9mm I wouldn't recommend one over the other. I have had all 3 with the 22 conversion kits. I have owned P226, with conversion, sig P210 with conversion kit and CZ75 with conversion kit. You will not beat the CZ conversion kits period. Its the only 22 conversion kit I know of that is not ammo sensitive. The CZ 22 conversion kit and kadet will literally eat any 22 ammo and for that reason alone its the one I highly recommend. The sig conversion kits do not work 1/2 as well as the CZ kits do. your money, your choice.