Oh, one or the other, huh?
CZ75, hands down.
I have a P226 and an M11A1. Two very smooth shooting, absolutely trustworthy, go to war guns.
The CZs are the same at a fraction of the cost.
That said, I just like my CZs a little better. Both have ok triggers out of the box. I put the short reset in the Sigs and it made the triggers tolerable. I put short reach and short reset triggers in my CZs and they are pretty fricken great.
Both guns have a similar level of aftermarket support as far as holsters and accessories, but the CZs seem to have a bit more as far as customizable internals.
Even without all that, I have some bone stock CZs that smoothed up very nicely after about 500 rounds or so and are quite the shooters.
And lastly, there's a saying that says 'You get what you pay for' but imho you get a little more than what you pay for with the CZs.
You can go with those high dollar Shadow 2s or AccuShadows CDR Glock is talking about, but if it's range use for you and not competition, Id start with something a little more basic and work up.
Dependant upon how close you are to me, I can put the P226, M11, and several different CZs ranging from stock to full custom in your hand to try out if you want.
The invitation is open.
Gratuitous CZ pic