I personally like the alien gear shape shift series. It has a base platform on which you can swap shells for different pistols. it has adjustable tension for a click in and out type. it also has a modulat thumb release system as well that you can put on or take off
here is the outside the waist band option about $52
https://aliengearholsters.com/shapes...b-holster.html
and the paddle style outside the waist band
https://aliengearholsters.com/shapes...e-holster.html
they also have a shape shift kit for $99.88. It has 4 carry options including outside the waist band, inside the waist band, paddle, and appendix.
https://aliengearholsters.com/bundle...er-system.html
If I were looking at just outside the waist band I would go with the first one.