Long time since I logged in! I'm getting very disillusioned with QFF, I'm giving up on crawling towards lifetime gold, and now I am based in London I think it's time for a change. Essentially, AA or BAEC?

(1) What is your home airport? (SFO, SCL, London LHR, HKG, Singapore SIN etc.)
Reply: LON
(2) How many miles do you usually fly each year & in what class? (<25K, 25k-50k, >50k)
Reply: 150-170K
(3) What types of fares do you usually buy ? ( First, Business, Economy etc.)
Reply: Discount economy, lately W
(4) Can you choose your airlines and/or, class of service?. Do you travel for work and/or pleasure?
Reply: BA is the only real choice for where I fly to. Mostly fly for work.
(5) Which routes do you fly most often (US Domestic, Transpacific, Kangaroo, in Asia etc)
Reply: LHR-HKG, LHR-NBO, LHR-JFK, LHR-SFO, LHR-BOM
(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: QF Platinum
(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, lounge access, award redemption rates
(8) Preferred Airlines
Reply: Not necessarily preferred, but BA most frequently, then CX and AA

Any advice would be much appreciated.