I have gone near and far and among my rankings:

Worst international business-
This is a tie- Swiss Air or British Airways.
Although both have impeccable service, I got a middle seat twice. If you are in business, you should be next to a window or an aisle. Apart from the middle seat, both lose more points. SwissAir only has personal videos on their Airbus and their games and entertainment pale in comparison to Virgin Atlantic's and CO 777. British Airways has an interesting business class set up where your seats make a bed and you are diagonal to your seat mate and in my case, had smelly feet.

Their economy class is nice as is their amenities package (how hard is it to convince some american carriers that you might need a toothbrush on an overnight flight?)

Worst domestic first
- Hands down it would have to be Delta. 2 class trans con service is terrible. 767 is a nice aircraft but first class along with the 727 and 757 are old and need seat upholstering and new interiors. However, Delta's biz elite is very good.