I guess I'll be the first to say I'm not a huge fan of OCW. Not for any fault of the OCW, but rather because of where I live. I don't have a garage big enough to fit my Camaro and I live in SUNNY florida, so I get streaking all the time when I use OCW. The only way around it is to spray, then buff immediately. But the point of a spray wax is ease of use, so it fails for me there.
If you have a garage OCW is the way to go. Can't beat the durability.
If you have a DD outside in the sun, the way to go is Megs D156. Can't beat the ease of use.
Just my 2 cents