The light and the dark side are just the two sides of the force, it's the power of the force, so whether you use it for good or bad is up to you. The "good" and "bad" stated in the universe is actually a faction war, really, between the Jedi and the Sith. In the modern Jedi Academy, the students are given the abilities of both light and dark for them to accomplish their missions, so the dark is just another power of the force--just like the light. If i am given the choice to be truly light or truly dark, i will choose neither of them. But if i had to choose between the two of them, i would choose the light side, because the light focuses on regenerative and defensive abilities, while the dark focuses on destructive and offensive abilities.
You're a Jedi and they invite you to the Dark Side, promising great powers – much greater than on the light side. Which side do you choose?
The light side.
This is not some abstract or fictional choice. The light side refers to authentic spirituality based in peace, love, and calm. The dark side refers to the basest natural tendencies in humans, the most banal.
The light side is the only route to true happiness (what we call "eudaemonic" happiness). It is the only route to making a difference worth enacting. It's the only route to the kind of life anyone wants.
Don't make me wrong but I believe the author posted wrong the question. I think he meant:
If you could controle the Force as in SW, would you become a Jedi or a Sith?
Because you don't choose to control the dark or light, you choose which controls you.
But a Jedi uses the Dark Side sometimes (even if they try to avoid that, but it happens several times in SW), and a Sith uses the Light Side too.
Light and Dark is a whole, like the Yin and the Yang.
So if I'm right with the question, I'd choose Sith, because I'd never leave my emotions behind, because I can be what I am as a Sith, while a Jedi is supposed to become a cake, a machine identical to everything else.
To me, a Jedi's are what we blame nowadays: brainwashed and easy to manipulate people. A Sith is free. I want to be free.
I would find it hard not to be seduced by the power of the dark side. I have to be honest about it. I think I would end up trying to take over the entire underworld of both the Outer Rim and core planets. But even as THE crimelord I put bounty's on all slavers. All slaves in servitude would be bought their freedom or outright freed the first day I take my rightful place as Sith Lord Crime Boss. Or better yet, an Evil Sith Abraham Lincoln.
I would join the Dark Side, for the jedi code as shown in the prequel trilogy is quite reminiscent of religious priesthood codes, forbidding natural emotions and trying to have an emotionless view of life, wich is a way of thinking that doesn't take natural human emotions in consideration and therefore is not valid.