Is J class necessary or just a want for you on this trip? The flight is just over two hours in the air and can be had in Y for under $200 return flying on TG's A350.
ANA seems the worst value as the surcharge is rather high, relatively to the other programs, and AC requires significantly more miles than others.
For UA or SQ it really comes down to which do you have the points in that you deem useable. SQ points I believe take time to transfer while UR to UA is relatively instant.