I use a quick adjust two point on my 5.56 AR (VTac), I wear the sling over my left shoulder. I'm left eyed, and therefore left handed with rifles. I still shoot handguns right, wearing the sling on my left shoulder seems to work best for me when transitioning to my handgun or switching shoulders (which I do practice).
Single point on my 9mm and 22 AR. I'd prefer a two point, but money is tight, and the single point works well enough for my plinkers.
Tried the three point koolaid for a little while, didnt care much for it.