I have a somewhat vested interest in this so I will try not to sound too bias...
Of the belts mentioned, I only have experience with the 5.11 with the plastic stiffener and of course my own belts so I will comment in as generalist of a way as possible.
If you want a belt that will last, find a full grain leather belt. This is leather that has not had the surface altered or "fixed" but is as it comes off the beast. This outer layer, or grain, is what gives a leather belt its strength and durability. Top grain leather belts will stretch and once the finish wears, is very hard to correct and make look nice again. Full grain belts will stretch as well, but not nearly as much as a top grain and they will maintain their stiffness (in that they will not roll over on you) for years.
For a carry belt, you ideally want a dual layer belt with both layers being vegetable tanned leather of at least 8oz in thickness. There is no need for fancy plastic liners with this setup (there are exceptions but they are outside the scope of this discussion). Many belts are made with oil-tanned leather. They look nice, but will stretch and not maintain their stiffness. Latigo leather is often used as well. Durability is better than oil-tanned but they are loaded with waxes which will break down over time and make them floppy (that's a technical term) and they tend to rub their color off on your clothes. Both of these are common in wilderness/sporting goods stores as they repel the elements well but neither is ideal for a gun belt. If, when the belt is brand-new, you can curve the belt the narrow way with your hands, it is not well suited for a gun belt.
I prefer a smooth liner (interior) but as long as the liner leather is full grain, having the flesh-side out for the liner is a personal preference. Expect the belt to be about 1/4" thick. I have two belts that I swap between. One is a 10 oz cowhide exterior with 9oz horsehide liner the other is 5oz sharkskin exterior with a 10oz cowhide liner. The sharkskin belt is not ideal for a heavy firearm, but works fine for my Kahr that is carried daily. The cow hide belt has been in daily service for 2 years and the sharkskin has been in daily service for about 6 months. Both have fomed to the nartural curve of my belt line but neither shows any significant signs of wear or distress. I'm a little more careful with the sharkskin belt, but the cowhide belt has had the piss beaten out of it.
Size should be no less than 1-1/2" and you should decide how important it is to "blend in" with your surroundings. 1-1/2" belts are now very common in most work environments but may stick out in a Business Formal dress environment. Ranger belts, well, unless you have a horse within 100 feet of you, they just stick out (IMO).
You will find that with a full grain belt, it can be cared for like a fine pair of shoes and will last many years. I routinely find myself on the pavement working under my truck scratching the heck out of my cowhide belt. A quick cleaning and some black shoe polish and it looks just like new again. A top grain belt would most likely be ruined from this type of ordeal. As a good rule-of-thumb, if the belt is made in China, it is most likely top grain.
Bottom line, regardless of who you buy from spend the money on a belt made with top-quality leather. You will be much happier in the long run and the belt will serve you much better.