Shimano, SRAM, and KMC; none of them are any better than the others.
Practically speaking, you may be right, but the Shimano 7901 chain seems to come out on top all the tests I've seen. I think friction facts rates it as the lowest friction chain, and tour mag rated it as the most durable.
http://www.tour-magazin.de/services/...11/page45.html
If you care about that sorta stuff, get a Dura-Ace CN-7901 (I'm sure they're cheap now that DA9000 is out). If you don't, then buy whatever is on sale.