Hyatt.
Too many variables to choose an airline partner for another person, but (in general) it turns on whether you value the comforts and amenities of business or first class air travel. $0.0133 is a really low threshold, it could probably be achieved with any UR partner (except perhaps Southwest, I don't know the details of their program.)
Agree.
I believe we are the very rare bleed on FT that has never flown Southwest and most likely not in any foreseeable future. I have no clue on how Southwest program works despite I do know the value of the companion pass. 100% of our travels are international therefore there is no place for a WN flight. Hyatt seems the best home for the UR pts, followed by UA and SQ. After AA finally devalues its program, SQ starts to look more attractive, especially if they finally resume the US-SIN flight.