I started with a Glock 17, and it's a great gun. Durable and accurate just as they say, and taking it apart down to the last component, cleaning, and reassembling is incredibly easy-- I'm wary of any gun I can't fully detail strip the slide on, especially those with roll pins. It's a tough gun, but just because you CAN abuse it doesn't mean you SHOULD. Still, using a Glock means never worrying that you're getting dust or water in your gun, or being afraid you under-lubed it. It's also very easy to repair with the inexpensive drop-in parts. The 2-stage trigger isn't bad per se (I prefer it, but many don't) but it does teach you very good trigger control with the heavy weight required to break it. I'd easily recommend it as a first gun, especially if you're unable to find a gunsmith in your area.
After all that, I've tried a CZ-75 a couple times, and it fits my hand extremely well, and seems to force my shots straight into the bullseye. They're also very cheaply priced for a semiauto pistol. It's a great gun, and if I'm ever in the market for another handgun, that's it. You MAY have problems with the slide stop lever breaking if you shoot overpowered ammo, where the Glock just eats it up. The barrel is also traditionally rifled, so WAY down the road, it may wear out faster. Still, both problems aren't exactly common or expensive to fix, and you're getting a great gun either way.
So I don't have a clear answer for you, but hopefully that shows a few more aspects of each. I don't regret getting the Glock for a second, but if you got the CZ, you wouldn't be undergunned at all. :mrgreen: