I personally like the M6 Auto Lock holster by Galco for the Glock. It does have a thumb release but it is between the gun and your body so it feels a bit more "natural" when you are getting a grip on your pistol in the holster. Other thumb breaks with the snap strap require you to work through the straps once the snap is broken. They also make a "pull off" retention holster that usually consists of a bungee cord or rubber strap that can be "ripped" out of the way and will not hinder you getting a solid grip on your pistol. Then of course there is the Serpa Level 2 with the trigger finger release. You might hear some varied responses on that one but IMO it leaves gun open to get a solid grip and the release is in that safety finger forward position that most shooters are used to so it's not a very big deal to me.