Are you talking about flying 100K a year with UA ? Are you trying to get status with those airlines ? Not really sure what's your question.

Just remember though, if you like to credit your miles into BR or NH or OZ, and use your miles for award tickets, all 3 of them have fuel surcharge in addition to taxes and fees, and it is not cheap.

Also, none of those 3 airlines are really good to put miles in, as all miles with BR and NH will expire in 3 years no matter you have activity in your account or not, unlike UA your miles will last forever even if you just use your UA branded credit card for non-airline activity. (Except NH, if you can be NH Diamond or above, the 3 years miles validity will exempt)

For OZ, even top tier Diamond Plus members get very little elite bonus. (if I recall it is 20% bonus vs 100% bonus as UA 1K). Also, using OZ miles for awards can be a little tricky, as they have quite many "high season surcharge", as well as "Suite Class surcharge" (F suite on 380 and 3 class 772), but also "Business Smartum surcharge" (C class on most of their 2 class 772)"