I had a SIG and sold it. (Bought a sweet S&W 629 with the proceeds.)
I have two CZ pistols and wouldn't dream of selling them; they're my most often used guns.
SIGs are very well fit and finished, but the design has some problems. In particular, I didn't get along with the SIG's high bore axis. Flippy, slow to recover. The CZ 75 platform has an excellent, low bore axis, like many of the other guns favored by practical shooters -- 1911 and Glock among others.
Also, despite all the vaunting about SIGs' accuracy, in fact, I got mediocre results. My CZs are much more accurate in my hands.
SIGs tend to come with superior first-shot DA triggers to the decocker CZs like my P-01. That's the only advantage I'd give the SIG, and it's a qualified advantage: my non-decocker CZ (a standard 75B, selective DA/SA with manual safety) actually has a nice smooth DA trigger, comparable to a SIG's.
I might try SIG again somewhere down the road (maybe for a .40, since CZ's .40s don't have as good a rep as their 9mms). They're quality guns. But for a 9mm I think CZ's the easy choice. It's just a better gun design.