The CZ is more premium to these eyes. If you didn’t already have a Glock, I’d say go with CZ. But, since you already have a Glock, why go to another platform that would need to be supported with the different mags, holsters and such? Plus if you are comfortable with your current G17, you shouldn’t notice anything different on a new one. Such is the case with my gen 4 & gen 5 G19s. If you want to shake things up a little, go with FDE or OD on the new one.