I think it will be Alaska for me if someone could validate my maths please.

International business class flights booked via Alaska, so on AS codeshare, get 250% EQM's, meaning the 4 x LHR-JFK returns I do a year, available with AS codeshare would be 8 x 3442 miles base + 150% which is 66,840 EQM. Add in at least one QR return to Singapore (125% as no codeshare available - although could use SQ), which is 2 * 3527 + 2 * 3857 for 14768 base + 25% for 18460 EQM's and I'm on 85,300 EQM's before adding in any personal travel.

I very rarely travel domestically in the US, and usually it's tagged on to an international leg anyway, so the loss of domestic lounge access doesn't bother me.