I play a Sith Juggernaut and I am tank specc'd including for pvp at this point I am level 44, and i love the gameplay of it, I find I have great survivability in both pve and pvp, I definitely at least reccomend trying it, I havent dabbled too much with the sorceror yet but I do know that alot of the time they end up as top dps and/or top healing in my honest opinion to expand more I would say make one of each try both and form your own opinion and see which fits your playstyle more

Mine is Lightbane Sith Warrior is Lord Nivek Lightbane

I find it would be much easier for you to go to http://www.systemrequirementslab.com/cyri/intro.aspx and select swtor from the drop down menu