I remain 100% UA due to MP, E+, and price. It continues to win on all counts v. LH and SQ (my primary alternative options) abroad, and obviously pwns US domestic.
That said, my largest concern for international BOB is special meals. For example, none of the fresh options are vegetarian. Then consider other types of dietaryneeds. I'm not sure how feasible it is to obtain this at the airport (esp. overseas) and have it "keep" for such a long flight. My special discovery IVML is now gone from TATL ex-IAD.
I'd even pay $5-8 to get that back!