First thing I'll say is that you NEVER believe just one test. One test is only "one" part of the story.
Having said that, Schaeffer is all I use. I have also had the opportunity to use one of those bearing machines to run my own test. You can dummy that test easily: put a little bleach on any metal, run it through a friction test, and it comes out unbelievably superior (emphasis on unbelievable). Brown paper towels work well on them too. It may sound like I'm against the test, but I'm not, just as long as it's run fairly and correctly, and you are aware of how you can be fooled.
I used to use Redline, but after comparing UOA reports (and again, they are not the whole picture either), I'll never use Redline again.
I also had a chance to run my own temperature tests on my air cooled Harley. Schaeffer ran cooler than anything else I tested, and I bought a lot of oils to compare.
Only my 2 cents worth, and no, I don't sell it.
Oh, gunny, it's green. Redline is red. Guess what color Royal Purple is