Though this is probably now a "retro BITOG" opinion, I'd cast my vote for German Castrol (GC), particularly the now un-findable green version (made up until the end of 2004 or so). The gold colored variant, made since then, appears to be just as good, however. But it's a thick 30 (nearly a 40, being over 12 cSt at 100F), so it may not be everyone's cup of tea. I just installed a fill of M0428... green GC in my '09 Camry Hybrid, and I can definitely see its thickness on the average fuel economy gauge (especially since the last fill was 0w-20 PP).
But, if you look back to some of our early days UOA, you can see some tremendous results on GC. I ran a fill of it in my wife's 2001 4.7L Sequoia for over 13 months and 10k miles, and it tested almost as good as new. An amazing oil by almost any measure.