I recently did the same analysis (comparing BA/QF in order to select a second plan to complement EXP status), and decided that QF was a better plan for me. It is a complex analysis because both earning and redeeming miles differ and each plan is better at something, so the mix of your travel pattern affects what is optimal.
QF does earn 60 points on AA domestic flights over 100 miles, and 150 points in F for transatlantic; this makes reaching top-tier significantly faster than for BA. Also easier to maintain in subsequent years. Finally the pool of top-tier QF plan members competing with you is much smaller than for BA, and there aren't any US anti-trust considerations between AA and QF as there are with BA (in the worst case there might be a future forced separation of the AA/BA programs -- unlikely, but a greater risk than with QF). In aggregate, for my travel pattern, it was about 30% advantage to use QF instead of BA and close to equal with using AAdvantage only. I did have to write a program to analyze which FF plan to use, and it now tells me what plan should be credited for each flight (far to difficult to optimize any other way). Somehow I think these FF plans have gotten out of control. The fact that I actually travel to Australia and do fly QF routinely helped sway the decision (I am more likely to need QF Platinum for irregular operation than BA Gold, for example consider flight densities and lengths).