Of course EaW came out first, so I experienced them in the opposite way.
Unlike Sins, where everything is one map zoomable to any level, EaW has 3 parts...a "strategic" galaxy map where you go from system to system (this is like Sins when you're building factories and labs and researching and whatnot), a "tactical" RTS-style map where the ships fight (this is closest to Sins' way of doing things for combat), and a ground combat level which has no analogue in Sins and is more like Company of Heroes with Star Wars units.
The Jedi Master
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Back off, man. I'm a scientist.