I've got a bit of insight on this one. First I would say that I love my aliengear CT 3.0. I wear it on a kydex reinforced hanks belt and often forget its there. I had a few scares when I first got the setup, only to realize that my gun was safely tucked into my belt, exactly where I had left it. I also have a cheap single clip holster found here:
Its great as a nightstand trigger guard cover or for wearing for a short period but after a bit it becomes uncomfortable and makes my hips and butt ache a bit (I carry at 4:00). This is where that padding on the Aliengear between the gun and your body is so amazing. It really does a lot to spread out the pressure of the gun against my body and makes the carrying experience much more pleasant and comfortable.
The only downside I have to the AG stems from my laziness. I prefer to have my gun in a holster before putting it on my belt, so that the trigger guard is covered at all times while I'm sliding it between my belt and body. The AG is not the easiest thing to put on and take off my belt, so I usually end up reholstering the gun with the holster already on my belt. I still much prefer the Aliengear to any other holster Ive tried though.
And I've never had a bad experience with leather but my grandpa has some leather holsters that practically feel like thick cotton now. Kind of turned me away from the idea.
PS- Also if you do go with the AG, it comes with a small tube of threadlocker to put on the screws so they don't fall out. DO NOT SKIP THIS STEP! They luckily give you extra screws because I lost one on the first day, but not once since after using the threadlocker. I hope this helps your decision a bit.
Stay safe!