is choosing faction obligatory? I rather play both so I could do both sorts of missions and learn maps from either perspective.
Or game require to choose specific faction for each character created, rather than one faction for all created types?
Each character can be customised for BOTH factions, actually.
Each mission you play, you choose faction.
Many people have a preference they're going to play as more often - that's what this poll is asking for.
I'm Security. I'll be playing through both stories, and I can appreciate both sides' reasoning. I mainly just think Security look more awesome, and my usual cool, calm demeanour fits them better.