(1) What is your home airport? (SFO, SCL, London LHR, HKG, Singapore SIN etc.)
Reply: YUL

(2) How many miles do you usually fly each year & in what class? (<25K, 25k-50k, >50k)
Reply: 40-50k, mostly economy

(3) What types of fares do you usually buy ? ( First, Business, Economy etc.)
Reply: economy & premium economy

(4) Can you choose your airlines and/or, class of service?. Do you travel for work and/or pleasure?
Reply: yes. Mostly work, 1-2 times per year for pleasure.

(5) Which routes do you fly most often (US Domestic, Transpacific, Kangaroo, in Asia etc)
Reply: mostly transatlantic (often YUL-LHR) and YUL-US transborder. I also fly YUL-MEX or thereabouts 1-2 times per year for family reasons.

(6) Do you have FFP status of any kind of OW or other airline at present? What is it? (AA Executive Platinum, QF Gold, UA 1K, LAN Comodoro, etc)
Reply: not in OW. Currently AC Elite, and will be A3 Gold in 2013.

(7) What is most important to you in a FFP? (upgrades on travel, priority services when flying the airline, extra baggage allowance, good award redemption rates, better award access, free - discounted lounge access, etc.)
Reply: upgrades in TATL legs, priority services. Mile redemption will most often be to Mexico.

(8) Preferred Airlines
Reply: BA

I am intending to switch to OW since my relatively frequent YUL-LHR legs a well served by BA, but I am trying to decide whether BA or AA should be where I credit to. It seems that AA makes sense due to the redemption criterion, but I prefer BA for transatlantic flights, and that is where I would appreciate upgrades the most. However, maintaining status will be a consideration and so I am interested in opinions concerning the best FFP strategy. Also, do either have a credit card in Canada? Many thanks!