The only reason I chose Security over Resistance is because I preferred their style options and the clean weapons. I'm a very Contemporary styled person, I prefer clean lines and sharp colors. I also happen to be very principled and lawful, so I can relate MORE to the Security side over the more rebellious side of Resistance.
(By principled, I don't mean I am very lawful... I have my principles that I feel make me a good person and I stick to them, almost flawlessly. But I don't mindlessly follow so-called "leaders" or what-have-you. Do not be mislead.

)
And maybe it's just a glitch in the match making, but I HARDLY join a game on the security side. Just the other night I played a ton of games and maybe only two of around 10 games I was on security. Maybe it was isolated, but still.