I have an A-1 from Murray which isn't too far from the military style slings, just uses a slide buckle instead of the claw-hooks. Top quality leather goods, I bought the sling as an afterthought while ordering a cartridge belt. Murray Leather does pretty slick cobra style slings.

I actually LOVE Allen Endura slings and the predecessor Uncle Mike's slings like them (but with strap slides instead of sewn-in swivels). Simple padded nylon, quick sliding strap adjuster's... It's just easy for me the way I like to carry my rifles. Super cheap, but durable and comfortable. "Bulldog" makes a nearly identical sling, but their metal strap adjusters are junk - eventually they bend and either slip, or you can't adjust them because they pinch or bind the strap.

My highest priority for a sling is the ability to quickly (immediately) provide bracing for my support arm in off-hand shooting positions. Carrying the rifle is the least of my worries, a length of baling twine can do that, and I usually carry over my shoulder or over my elbow anyway - the only thing I want my sling to do is provide support for my shooting position. That drives my favor for the Allen/Uncle Mike's slings over any other type. No matter from which position I'm shooting nor what coat thickness I might be wearing, I can adjust the slings to EXACTLY PERFECT length for maximum support.

Take a look at the Murray stuff. Their A-2 Cobra with the thumbhole is kinda neat.