I can’t solidify a choice for absolute favorite ATM, but I did enjoy seeing the GBS news channel in Aquaman and Shazam.
Robins suit in BvS
Toss up between the Rainbow Batman throwback in BATB or the giant penny in Lego Batman: Heroes Unite. The penny is so iconic and yet they managed to pull it off in a way that kept it with the strict LEGO physicality rules.
The Blaze Comics building in Man of Steel