I have a Star Alliance program and a Skyteam program that I usually stick to, but I want somewhere to bank occasional miles from AA and BA. I don't expect to be flying enough in tier-earning classes on any oneworld partner to reach any elite status whatsoever, I just can't make myself not saving the miles anywhere at all.

Since BA miles will expire after 36 months and AA miles after 18 months, and BAEC allows for household accounts, I'm leaning towards BAEC. Have I missed something fundamental? Does any of the two programs, or any other oneworld program, ever have campaigns with sign-up bonuses?

Thanks
tourist