When I was researching the classes, I saw that the majority of "caster" classes rely heavily on being in party with others. Being that I was starting fresh on a new game without knowing anyone, I figured that wasn't a good choice. Then I read how Rogues and Warriors were efficient at doing things solo. Once I'd read into them both, I decided that Rogue was more my thing - stealth, fast attacks, high damage, etc. The fact that I chose human was more of an aesthetic thing.