At the top is my Gear Sector model GS-2P dark earth two point modular sling, they have different adapters, strap, HK hook, heavy duty push button sling swivel, if you have other guns just install two adapters (front and rear) and use the same sling on all your firearms.
The sling on the bottom is Blue Force Gear model Vickers VCAS padded 2 point sling.
This is also a Vikers VCAS 2 point sling standard model without any padding.
LaRue Tactical 2 point padded sling, it have a built-in front heavy duty push button sling swivel and a front Fastex side release buckle, the rear QD sling swivel are also included with the sling.
The LaRue sling is made for them by Viking Tactics, if you don't prefer the front sling swivel and front Fastex side release buckle, order it from Viking Tactics, they also have non padded models.
If you would like just a basic 2 point sling for now but would add accessories to it later on, here's a Magpul basic MS1 2 point sling on a Colt LE6920 M4 carbine.
If you prefer to use your sling with tension when shooting as a shooting aid either the LaRue Tactical or the Viking Tactics slings are great for that, once tightened they don't loosen.
If you don't care to use the sling as a shooting aid any of the Vickers slings is a good choice plus it have the thickest webbing material if you like that feature.
The Gear Sector is the narrowest webbing width at 1 inch but are double material, and as I said before modular which you could use just one sling for several firearms.
Padded or non padded, if you carry or a long time the padded helps which is more comfortable.
Most of these slings are available in different colors black, tan, green, etc, some are also available in camo.