Which live action batfamily costumes to you like best?
This isn't really about which interpretation of the character you like best, as far as film/tv story and acting is concerned, but more about the visual appeal and functionality of the suits (or the story of the suits in-universe or behind-the-scenes).
For me:
Batman - Dark Knight Rises (I love the whole armor idea behind it, plus the cowl is good)
Robin - Titans (I have not yet seen this series, but the suit is great)
Batgirl - Birds of Prey TV Series (I heard the show was bad and I haven't seen it, but Batgirl's suit looks cool, although the mask could have been better IMO)
Catwoman - Batman Returns (this one to me is much more visually interesting and iconic than the Nolanverse one)
Batwoman - Arrowverse (it looks cool, plus there isn't any competition)
Huntress - Arrowverse (I'm not familiar with this character, but the Arrowverse one has a mask and the only other versions I could find lacked a mask - I prefer my DC superheroes to have masks unless they are Superman's family
Here is a documentary about the Batsuits: