I am in a similar position to FlyingJoy. My primary carrier is BA and so I am GGL and more on BA. But, I fly to lots of other places. I'm heading to YYC next week. I had used my Star Alliance flights to be Gold on Agean, but am now Silver. Alas, I fly a fair bit on a Star Alliance carrier (about once a month), but it is my client and gives me business class tickets but get not FF points for these tickets -- if I were paying, I would have high Star Alliance status. My primary interest is in getting into lounges and going through fast lines, not miles themselves as I have several million accumulated miles and not enough time at the moment to use them. Is Turkish now the best choice for me? Better than AC?

(1) What is your home airport?
BOS for about 2/3 a year and SFO about 1/3 a year
(2) What types of fares do you usually buy ?
Business/First for business and Premium Economy for personal unless short haul. (on Oneworld I am usually upgraded).
(3) How many miles do you usually fly each year?
Not sure how many on Star Alliance this year on paid tickets. Maybe 25K.
(4) Do you have any kind of status at present? What is it?
BA Gold Guest List, Star Silver on Agean
(5) What is most important to you in a FFP?
Lounge Access and fast lines.
(6) Which routes do you fly most often
BOS-LHR, SFO-LHR, BOS-SFO, SFO-FRA, LHR-FRA plus BOS-YYC, BOS-YYZ, and random flights everywhwere (BOS-LGA, BOS-MEX).
(7) Preferred Airlines
in Star Alliance, SQ. AC has become decent. I don't especially like UA and often fly JetBlue or Virgin America from BOS=SFO. Maybe I'd feel differently if I were high status on UA.
(8) Do you travel for work or pleasure?
80% work, 20% pleasure. Sometimes combined. [Plus I really like my work].