(1) What is your home airport?
VIE

(2) What types of fares do you usually buy ?
Y (but I'd be willing to treat myself to the occasional C if it would also help my status)

(3) How many miles do you usually fly each year?
50-70K

(4) Do you have any kind of status at present? What is it?
No. I've been mixing all kinds of carriers without giving much thought to rewards programs, but I'd focus on a single program now.

(5) What is most important to you in a FFP?
Primarily: Priority Check-in, Priority Boarding, Economical Upgrades
Secondarily: Lounge Access

(6) Which routes do you fly most often
VIE-LHR and VIE-MXP. VIE-MIA or similar twice per year.

(7) Preferred Airlines
OS and AB, because of convenience (non-stop from VIE to most major European destinations).

(8) Do you travel for work or pleasure?
Almost exclusively for pleasure.

From my research so far, given my primary preferences in answer (5), my guess would be that UA MileagePlus would fit best because Premier Gold seems to be the most easily achievable: I get about 1.600 PQM towards the 50.000 for a flight operated by OS where OS would only give me 250 status miles via Miles & More.

Is my interpretation correct?

Thanks in advance for any advice!