By now we all now about the security and resistance. But during online play would you get to choose your side? I would love it if i could be resistance every round i play but... Come On i mean, the way i see it a truck load of people are choosing resistance. So the only real way to even out the scales is for the server to pick your side for you.(I left this comment to go towards multiplayer only. NOT SINGLE PLAYER OFFLINE.)
Both sides are pretty even matched when it comes to people choosing a certain side. You can play campaign and always play the same side, but I think it's way more fun to play both sides, to not always play offense (or defense) on the same map.
Also, there are plenty of threads about security or resistance, please use one of them to continue.