I used to think Tyranids had the most options in deploying their troops, but apparently that is no longer true with the new codex.
Similarly, which armies are best at messing with deployment?
Either adding to reserve rolls or making it more difficult for the opponent to deploy their units.
I don't have access to all the codices (I own Chaos Daemons and could needle a friend about Eldar & Necrons), but to be honest, I am not really sure if deployment is really an army thing, but rather something specific units do.