Hi all, this is my first post to this forum so please bare with me.

I'm typing this at NRT, I am currently a silver-tier on KrisFlyer and will be attaining gold in 1 month. I have never ever in 4 years of frequent flying redeemed miles for anything. I have about 100K miles on SQ and 80K on CX, now that I live in HK, I have flown CX a lot because of price and availability, but since I started traveling back to the US quite often, I am trying to fly *A more often. It seems that by being with KrisFlyer, I can't use any of my miles to get upgrades on NH, UA, AC. Does this mean I have to be flying with SQ? For personal flights where I want to upgrade, I definitely wouldn't book the costly SQ flights (typically double or triple that of CX) even though it's my favorite airline in the world. Since I generally move around a lot, I'm not sure which FF program I should be using for *A and 1W. I'll be moving to Tokyo in a couple of months, so being with *A will pay off, since imo NH >> JL

Thank you kindly in advance for your advice.