Relocating to London for a year; need advice on which OW program to join. No status with any OW, have A3*G though, apart from status with couple of India based airlines.

(1) What is your home airport?
DEL (shifting to LHR for a year though)

(2) How many miles do you usually fly each year & in what class?
~50k (Y on domestic; J on international). Primarily on 9W, IT (no alliance); have *G status

(3) What types of fares do you usually buy ?
See above

(4) Can you choose your airlines and/or, class of service?. Do you travel for work and/or pleasure?
Can choose airline most of the times (given similar fares) but not service. Work mostly

(5) Which routes do you fly most often?
Mostly India domestic till now; will change to largely intra-Europe travel.

(6) Do you have FFP status of any kind of OW or other airline at present? What is it?
No

(7) What is most important to you in a FFP?
(a) Priority check-in, baggage (b) Upgrades, (c) Lounge access

(8) Preferred Airlines
None

I got to *G with A3 in just 6 DEL-SIN flights (just needs 20k M&B miles), is there a similar program in OW that makes it relatively easy to attain Gold status?