I reckon Cygnus and Dragon, same as before. The point about docking vs berthing operations is a good one. But what I think is a real shame is that the European ATV isn't set to fly any more. It had over twice the payload capacity of the Dragon, even more vs the Cygnus, all pressurised, automated docking. And it could reboost the station which I don't think any of the American commercial projects can. Is there a reason other than money it got canned?