OK. I'll play too.
I've gone through quite a few belts since starting my concealed carry journey, and thus have expended what seems to me a small fortune on this "simple accessory." I'm sharing my experiences here in the hopes that it'll help someone. Your experiences and opinions might differ. That's perfectly OK and to be expected. I consider myself a fairly good tester of belts since I tend to cinch 'em up tight and my "tactical donut" build puts a lot of stress on them. Most people quickly find my style of tight cinch-up uncomfortable, but I've worn a belt in this manner since I was a kid and hardly notice it, even after a very long day of wear. If a belt can withstand a year or more of my daily wear and tear, it is a good one, particularly if it is seeing double duty as my gun belt.
In general, I've found that most "dress belts" and even "heavy western wear" belts one typically purchases in clothing stores have too much flex for waist line carry. They can be OK when carrying a piece that weighs under 20-24 ounces IWB since all the belt must do is suck the holster/gun up against the body and little, if any, twisting torque is applied to the belt. A heavier piece, riding high above the belt top, will quickly reveal the weakness of such a belt to twisting and flopping around. The holes also wear out pretty quickly on such belts. They are HOPELESS for OWB carry with anything.
The top tier gun belts, in my opinion, are purpose made gun belts. Such a belt will be made from thick premium leather, having a single layer. Said belts are typically 1 1/4" wide or 1 1/2" wide. 1 3/4" width can be had, but "look weird" on all but the biggest guys. Thick premium leather single ply gun belts are expensive because leather having the requisite thickness for a quality single ply belt is very expensive.
Belts that have either a heavy synthetic reinforcement or a steel reinforcement sewn in also work, but will wear out faster than a purpose made premium leather gun belt.
I'd place a couple of 5.11 belts into the pretty darn good category for everyday carry. I wore the 1.75" wide 5.11 Operator every day for several years. It was great, but the extra 1/4" width forced me to obtain holsters with wider belt loops for anything I wanted to carry on it. 5.11's 1.5" wide Arc leather belt works OK if you need something a bit more "dressy", but it falls kinda in-between the run-of-the mill department store belts and full blown premium leather gun belts for rigidity and durability. By way of comparison, I've also owned and used a couple of the Kore belts. They were OK, but didn't live up to my expectations long term. The 5.11 Operator belt outlasted them by at least a factor of 2. I apologize in advance if you're a big fan of Kore, but that is what my experience with Kore was.
That's the sum of my experience since starting my concealed carry journey. It's not exhaustive by any means, and belt choice is as personal as holster choice. These days my money will always go to a premium single ply purpose made gun belt for "formal" wear or to the 5.11 Operator for daily wear.
One additional note about waist line carry using a belt either IWB or OWB. Holster loop size needs to match belt width. Otherwise, the holster will "walk around" on the belt, no matter how tightly the belt is cinched down and no matter whether the carry is IWB or OWB.
Take care. All the best to you, sir. 
