IMO the Archangel is a big step up from the Joab. I had problems getting the gun to position correctly with the Joab. I have no such isssues with the Archangel. With regards to the belt, the belt in the picture is an A&C Custom Gun Leather and is 1.25" wide. I use 1.25" leather belts because I mainly wear dress slacks or suits during work and I need a belt that can fit through the belt loops on those pants. I have three and they work well for me. I have one of the older versions of the Archangel that had different Pull-the-Dot straps. They are rubber and have holes in them so that I can make adjustments for the two different belt sizes I wear.
I also have two Wilderness 5 Stitch Instructor belts that I sometimes use. I can't feel a difference with comfort or ride while using the leather belts or the Wilderness belts.
I have used the Archangel with a Glock 19, and the gun tucks in nicely and is very concealable. I think you are really going to like the new holster since you are moving from the Joab.
Here is the Glock 19 with the Archangel.