Ello Atsy is a single point more than Nien but I don't believe his ability is as strong. Whilst he is perhaps the T-70's ultimate repositioning tool thanks to keeping the Talon Rolls white, it is how you upgrade him that will effect the rest of the game.
The usual suspects however work well. BB-8 can allow for some wonderful opportunities to catch out lower pilot skill ships, and of course Veteran Instincts or Adaptability can increase his pilot skill into more formidable areas.
Autothrusters will compete for the zero point Integrated Astromech and it all comes down to your play style and how many points you have left over.