I only have only shot the Sig, but I can at least share my experience with that. Out of 600 rounds, I never had a single malfunction. That was about 550 winchester white box 115 grain, and 1 box of Hornady critical defense 115 grain, and 1 box federal hydrashock 124 grain. When fired single-action, it was also incredibly accurate. For a $400 dollar gun, it's hard to beat regarding accuracy and reliability.
However, there were also several reasons I ended up selling it. First, it's larger than other comparable pistols such as the Glock 19, XD, or even the steel-frame Sigs. It only comes with one mag, and extras are upwards of 40 dollars, but that probably won't be much difference from the CZ in your case. Mainly, the double-action trigger on the gun is possibly the worst I have ever experienced. I suggest that if you can't rent one to try out first at a local range, at least go see a dealer who is comfortable letting you safely try a few dry-fire squeezes. In all fairness, I have found I generally don't like double/single action guns, but prefer a consistent pull every time such as striker-fired pistols or 1911's.
Since you're also considering the CZ, I would assume you may like a double/single action pull. In this case, you may like the trigger more than I did. Either way, be aware that it comes with a very hefty weight on the first shot. If that part doesn't bother you, I have no problem at all recommending the SP2022 as an accurate and reliable defensive handgun.
I don't know if any of this information helps, but I wish you the best in finding the right one for you.
Carry Safely, Carry Proudly, and Carry ALWAYS