Definitely Arkham City. That game just had amazing aesthetics in general.

I always found it weird that Arkham City went for the edgy/mature shaved head Chris O’Donnell look on Robin but then gave Nightwing perfect anime/Final Fantasy hair.

Arkham Knight Nightwing suit

All of them suck, but the AC suit sucks the least

My favorite is the Injustice 2 suit.

Really