Boeshield T-9.... one more vote. At Interbike every year the T-9 booth has a steel plate which has been sprayed with various lubes (WD-40, Phil's, White Lightning, etc) and weathered. Of course the part of the plate that was sprayed with T-9 has dramatically less corrosion than the other spots. Not sure about the transferrability of this test to bike chains, but it's easy to apply and can be used on everything on the bike (except where you want grease).