Well.....
I shot both a couple of Glocks and then a CZ Shadow that had a trigger job. Based on this I bought the Shadow for what it could be turned into with a trigger job. But even the stock Shadow has a nicer trigger than a stock Glock for my tastes. YMMV of course. As for accuracy I found that I shot equally as well with the Glock as with the CZ Shadow. And in both these cases the groups were better than with other options. Those being a Berreta 92FS, S&W M9 and a Steyr 9mm. An STI Trojan in 9mm is actually a nicer gun to shoot than either the Glock or the CZ Shadow. Both the trigger feel and the groups are nicer and tighter than all the others.
Why I chose the CZ over the Glock in my case was for the overall feel of a steel gun over a plastic gun in recoil and for the overall look and feel of the CZ which just looked better to my eyes and felt tighter in every way on all the controls.
The best option as I mentioned in my post on page one is to do what you need to do to get to try out both options prior to buying.