I've shot both. I own a G34 and had a lot of rounds through my last 34. The 75 was a standard duty style gun.
But in comparing two stock guns, or guns with no more than $50 worth of mods, I'd pick the Glock. The trigger is better because even single action , the CZs trigger is not that great.
I'm sure it can be modified to be much better than the glock's. I guess it comes down to budget. If you have a $600 budget total, the glock is better. If you have $1500 and don't want to shoot in classes that single action CZs are not allowed in, then the CZ is probably a better bet.
I did shoot a CZ, that a friend had purchased already heavily worked from the CZ custom shop. I don't know much about the gun, but it was almost nothing like a normal CZ. It was single action only, the trigger was magic, it was heavy, steady, and very very accurate. It was a truly custom gun.
Of course, I think he said it was a $1600 gun. Thats enough for 3 - G34s.
Don