As the Empire I'll build a Deathstar then systematically wipe out all but 10-15 or so planets supported by a massive fleet to protect my baby of course. Then I've only got a few planets to watch over and they'll be so scared they'll be offering jedi witch trials whenever I blink a them.
As the Rebellion I'll ambush a lot - try to whittle down the empires best units as I withdraw until finally I counter-attack somewhere else with overwhelming forces then just lead them for a merry dance as they try to catch me.
I wonder if when planets get captured if there'll be civilian casualities - if so It means losing a world and then retaking it will be very bad - be better to hold it - if so I may be screwed as Rebellion. Oh well, doot di doot di do