I can echo those here who say you really have to chose what works for you and sometimes it takes a lot of trial and error....
I've only been carrying concealed for 3 years but have tried many different holsters in that time. And I've taken to making holsters from Kydex.
One thing about Kydex/leather is the leather will conform to your body but the Kydex will not. I have been making my holsters by forming them on a curved support that mimics my hip, so I can get the leather curved and the Kydex curved together and then set my retention that way.
I can take probably any hybrid holster, hold it upside down and flex it and have the gun fall out. It's the nature of marrying two dissimilar materials together.
I really like my own holsters, but I make them to fit me exactly, my curve, my carrying position, my ride height. These parameters are different for every individual. You need to find the holster that meets your individual needs, and only you can do that.
Which brings us to the popular holsters.... I think they are popular because they have done a lot of homework and balance each gun model comfortably on the belt, position it for good access, and use good materials and workmanship. But individually we will all have differing thoughts on how they feel and work for us.
My own holsters are different for me since I've lost weight.
I like Lobo holsters... Are they the best holster out there? No. Sorry Ray

But they are a good holster at a good price from a good guy and they are available quickly. I use them often!!
I just received a Milt Sparks Summer Special 2 and wore it for a day and like it very much. It is nearly twice the price of a Lobo though! I still need to tweak my carry position as the cant is a bit more that I usually use, and the gun I have it for is a bit longer than most I carry. I may change the cant a little, it's too soon to tell. But it is comfortable and easy to use. I'll compare 4 different holster manufacturers for that gun when I get the rest of the holsters in....
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