It depends on what you want on a sling. Since we are talking quick adjust slings for (assuming) a "tactical" rifle...
I prefer to
not have buckles and clips. They rattle around and take up sizing space. The QD on the sling mount will suffice.
I like the thumb loop adjustment. It seems fool proof, even with gloves.
A nice wide web is good, but not the wide, padded section that looks like it is a hunting sling hybrid.
This is durable, stays where you put it, and adjusts easily.
https://www.amazon.com/gp/aw/d/B00JK...b_b_asin_title
But it isn't as cool as spending $50 on a sling.