Doug, I wear IWB belts as I feel (MY OPINION) they conceal better with my body build and clothing style.
I have 2 IWB holsters for my 1911 - a Milt Sparks Versa Max II and a Nick Mathews #1.
Comfort for IWB will be based on holster design and material, but also pant size and gun size. Thicker guns may be a bit harder to carry IWB. That is one reason I love my 1911. It is a 4" barrel, single stack and fairly thin. Glocks tend towards the wider side.
Here is my VM2 (www.miltsparks.com) in horsehide/shark in Cordovan:
Here is my Nick Mathews #1 and dual mag holder in black leather (www.nmholsters.com):
If you want comfort, go leather. If you are using this for IDPA or something, kydex may be an option. I've seen a few that have a kydex holster but backed by a leather sweat guard and are actually quite comfortable from what I've heard. I can't recall the names right off hand.
IMO, you will get what you pay for, so don't be afraid of buying a quality holster like an Alessi, Sparks, Delfatti, etc. But also realize that for some of them, there is significant wait time involved. I know Top Gun Supply had VM2's in stock earlier today, but they go QUICK!