Dedicated sides, or make your own?

With Planetside we saw outfits forming in three seperate sides, rigidly enforced by the game mechanics.

In darkfall it looks like there will be 3 sides Humans, elves and dwarves, orks and wolfmen and then the strange alfar bat elves.

However in darkfall clans can change alignment and go evil, allowing them to freely attack, and be attacked by everyone.

This allows the players to develop their own sides, if a human clan wants to wage war on elves then they can, things will be difficult, but they can do it if they wish.

I really like this free system, it really lets the players shape the game into what they want.

What do you think the best system is?