bungee slings are good as you can loop it on your weak side to have full access to your secondary holstered on your strong side.
the looped one point is nice to have. the one point that attaches to a d-ring on your vest is also nice. I like both and use both but can't really say which I prefer. all depends on the primary I use I guess.
I use this primarily for my lighter/shorter AEG's and shotty:
I use this primarily with a long primary: