If you can try shooting one of each. That is the best way to start. I own both the G19 and the CZ75B. My first gun was the g19. I learned to shoot on that gun. If I had to do it all over again, I think I might have started with the G17 because of the longer barrel and sight radius. With that being said, for someone just starting out, if the glock fits you and points well for you, it is hard to beat. They are very reliable (so is the cz), but more importantly they are very simple. There is only one trigger pull to learn, and no saftey levers, or other controls to have to worry about. It is also very easy to field strip and take down for cleaning, and tolerant of a lot of abuse. Both guns would be good choices, and if you don't like either of them you should be able to sell them and get most of your money back. I have spent about 10 years so far trying to find the "perfect" gun for me, and I can honestly say the G19 is still right at the top. The cz is also a great gun, but overall is a little more complicated, and does the same thing. I will say my CZ75 is a little more accurate, and softer shooting than my glock.