My fighting rifles all have BFG padded and regular slings, even my tikka compact at the moment . I like the slider feature that allows you to sling it around your body and secure it for negotiating terrain etc.
I was looking at picking up one of the rubber type like the "claw" I believe but I'll also likely be running a gun bearer on my pack so may not need a sling a ton but I believe all long arms should be equipped regardless.
Either the slim version of the Claw or a simple 1" webbing strap with silicone sealer smeared on for traction. The webbing is super light & I can make one up for around $2
I use two, the claw for lighter rifles and for my heavier rifles, I like the Specialty Outdoor Products sling, it sticks well and has some stretch to take the edge off when carrying my rifle for long distances.
RifleCraft RS-2 is my hands down favorite sling. I'm a big fan of shooting slings and this is one of if not the best, I like it even better than the old military issue leather. Once I got my first one I had to get several others for my favorite rifles.