When my employment went from a small PD to a 250 person Sheriff Dept, the G17 was the Patrol issue, G19/26 was Detectives and Admin carry choice. I had the G19, still do, and feel it is a trade off between the others. The G26 is a great choice, all can mix and match mags, holsters and mag cases. If I didn't have a G19... a G26 would be fine.
Sometimes I carry a G21 strong side, G19, mirror image left side. No issues with either. Both are 3rd Gen.