I just realized I never answered the question.

I prefer Cass.

I hate sounding as I am ganging up on the TS, but... Spoiler is the only one who has been a sidekick.

I cannot pick sides because out of those four my favorites are Babs and Steph. I also like Helena Wayne better than Bertinelli.

Kate Kane the wig damn its shit

Spoiler

Oh this spoiler oh shit sorry i thought you asking who can win

Lol

Lmao

Spoiler is Stephanie Brown, the fourth Robin and Batgirl.

She’s my third favorite after Dick and Tim

Spoiler. Also, Barbara is her own self, and so are Helena and Kate. Only Spoiler has been Bruce's sidekick before.