Hi all,
Appreciate any advice here. Flying LA-PEK later this year for vacation and trying to choose airlines. As dates get closer and plans confirmed, price will matter more, but for now, assuming all things are equal, which would you choose between these options (business class)?

Air China, nonstop 777 (most convenient, but I've heard bad things about Air China service)
Asiana: 1-stop in ICN. (A380/A330) Pretty convenient. One stop doesn't add too much to flying time. Good pricing now, subject to change of course.
United: LAX-SFO-PEK. (737/777).
Singapore: LAX-SIN-PEK (A350/B787). Currently the best priced business class fare on my travel dates, and I've never flown SQ biz. It's supposed to be great, but that's awfully far out of the way. But, if the price is right, might SQ service be worth it?

Any and all thoughts appreciated.