I had ~30k miles in my SQ KrisFlyer account that were expiring and could not find an appropriate award flight, and so ended up purchasing a flight with Scoot at the terrible value of ~0.6¢/mile. This got me thinking about switching to bank my miles in a different FF scheme. Given that I'm trying to redeem for US Domestic flights, United seemed like a reasonable choice, but the earning rate at 5x ticket price seems like poor value for Transpacific flights that retail for ~$1000 but are a total of 16k miles travelled r/t. Are there any other options I should consider?

(1) What is your home airport? (SFO, LAX, MCO, etc.)
SFO

(2) What types of fares do you usually buy ? (C, F, Y, etc.)
Cheapest Economy Available

(3) How many miles do you usually fly each year? (<25K, 25k-50k, >50k)
25k-50k

(4) Do you have any kind of status at present? What is it? (UA Silver, M&M Senator etc)
No status; ~30k Avios banked with SQ KrisFlyer.

(5) What is most important to you in a FFP? (Frequent upgrades on travel, priority services when flying the airline, good award redemption rates, free lounge access, etc.)
Good award redemption rates, availability (and simplicity of booking) for US Domestic flights --- I don't think I fly enough or in a high enough class to collect miles for more expensive awards.

(6) Which routes do you fly most often (US Domestic, Transpacific etc)
US Domestic (~5 per year), Transpacific (~2 per year)

(7) Preferred Airlines
SQ, ANA (but I fly most often in United)

(8) Do you travel for work or pleasure? (Can you chooose your airlines, class of service?)
Travel primarily for pleasure. Can choose airlines but generally am sticking to cheapest economy ticket available.