I have the green fiber optic on some of my guns and I am very pleased w it. Mine are set kinda high because they were designed for tactical guns and suppressors. Holsters must be designed to accommodate the extra height or it's hell on the sight channel.
The beauty of Glocks is the variety of after-market selection. Pick one you trust and if you don't have an installation tool (sight pusher) I w send slide out.
Some competitors like the new triangle sights. If your going to change them, it's worth a look. I prefer adj. sights so I can move the POI to suit whatever ammo is on sale at the time.