There are too many REALLY GOOD holster makers out there now to say who's "best".
Among them are Sparks, Brommeland, High Noon, Ken Null, Kramer, Mitch Rosen... there's more but that's just the ones that come to me immediately.
All you need to do is to decide who makes the exact type you want and go from there. The only problem is the long lead times from most of them.
Carter