Is UA MileagePlus or NH's ANA Mileage Club better for a SEA-based flyer?

My flight pattern is 2-3 domestic transcons/ year in Econ or Econ+, and about 2-3 SEA-TYO or -Southeast Asia/ year in Econ+ or business. Possibly Europe once a year.

Cheapest across the pond flights for me are either from SEA or YVR when flying ANA. There are some really cheap fares in business on TK all the way to Southeast Asia but with all going on in that part of the world, I would probably just avoid for now.

I keep hearing how 'disadvantageous' the ANA Mileage Club is, although going with UA, it might end up being another Delta in a year or two.

Insights on best program for me would be appreciated!