I much prefer my Mercenary over my Gunslinger, but I got tired of the Empire. I don't like being the bad guys, even if I'm the good guy of the bunch (light side BH). They keep sending me out to do missions that are inherently bad, such as blowing up a bunch of cryo'd people on Taris. How about no? How about this mission being dark side regardless of what you do? Where's the choice in that? Also, Imperial cantinas and stations are so... so... uniform. So very dark gray and red. The Third Reich reference is strong with this one.
Coruscant holds a special place in my heart, and while you only get to see a very small part of it, it is so much better for my mental health than Dromund Kaas. Like Vette says: "Welcome to Dromund Kaas: where dreams go to die and legends are forced on the galaxy." The Republic side is much more... happy. Naive, yes, but also so very happy. Everything is over-saturated orange, blue, and green, and smooth edges. It makes me happy.
Except for the ships; they're ugly as sin.
____________________________Please "talk up" if your comprehension white-shifts. I will use simple-happy language-words to help you understand.