Both are nice but Arkham Knight was perfect. Such a badass suit and one that would strike fear in a criminal within Gotham city. Really love how flexible it was yet so armoured, made sense for the type of situations Batman got himself in.
Honestly I like both of 'em. But the Arkham Knight suit is armoured and durable and also looks kinda cool. Dark Knight Trilogy suit is better than the Batfleck suit (Not the Tactical Armor)