I guess would opt for the airline that allows upgrade to biz/first class international as your partner

I can tell you from multiple recent expereince on KE that their biz int class is sub-par and we paid for seat with hard-earned miles! Sorry Palms, I beg to differ--we didn;t even get the FA "bow" the last 2 trips

DL does not typically upgrade OAL--nor will you get that from NW because they don't even upgrade DL nonrevs or their own personnel w/out surcharge

We've NR'd out of ATL sev times on DL as 20 yr seniority and it was heaven in business. no clue what coach was like--they realy keep the curtain closed