I think it depends on your intended use for the rifle, and the amount of money you want to spend.
For a three point you can't go wrong with Specter (formerly CQB solutions). If you're gonna be carrying the rifle around alot and you're gonna be outdoors (no CQB) then I think a three-point is the way to go.
For a single point you can go with Specter or Troy. If you're gonna be using the rifle just at the range, or not carrying it all day, or if its your home defense rifle then I would go single point.
If you want the option for both and the option for two-point, then you can get the SOC-C contractor pack from Blue Force Gear (maybe Specter has one too, I'm not sure). This sling gives you the option of single, two, and three point all in one.
There are also variations between the slings and their attachment methods and if they have a QR backup.
There's really alot of options and it depends on personal experience and what you're gonna do with the rifle.