Tarkin with a Star Destroyer and a VSD and anything else you want to throw in still give unparalleled flexibility. If you put a Weapons Liaison or a Defense Liaison, then you almost don't need to plan your command dials, and if you do plan them well, then you get awesomely effective commands with a command and a token. Upgrades like leading shots can get you some rerolls extra hits that you are missing by not taking Vader or Screed. Yes, he is expensive, but he's also awesome!
The Rebels can get close to this flexibility with Leia and/or the Tantive IV.
What do you think?