In case it's helpful to anyone:

I'm transitioning to just flying whoever has the best deal/times, and have been looking for the best programs to affiliate with. I formerly just earned everything with whatever U.S. airline that I flew. Given the generally limited amount I fly, I'm really just interested in earning and redeeming; status isn't that important. [Side note: I AM making Silver on Delta this year, but I'm ultimately transitioning that to Flying Blue.] I was able to determine Flying Blue and Aeroplan worked best for me, and was planning to go with Avios for One World . . . until the recent devaluation of Avios points. It used to be that Avios redemptions were a bargain, but no more. I did several side-by-side comparisons, and I'm better off just earning and redeeming on AAdvantage now. (The earning is mostly equivalent.) It's unfortunate, because I can transfer Avios points from my credit cards and not AA, but alas . . . . YMMV.