Rings and webbing; my mainstay after all this time.
Whoopies aren't remotely difficult to use and they will certainly save some weight, but there are parts to deal with; sling, toggle, hugger. I like my one piece rings and webbing setups the best. Unless I'm really on a gram shaving trip, in which case I'm a whoopie guy, I'm carrying rings and webbing.
Dutch Clips vs Biners is a whole other story. I switch between the two constantly. I think the biners are a bit quicker and simpler to use, but the Dutch Clips have the cool-factor that simply cannot be denied.