It's a tough call, from these clips. I'll admit that I haven't watched the Brave & the Bold or Under the Red Hood, though I probably ought to watch the latter at least. It looks good.
Bennett seems alright, but he's the closest to Mark Hamill in spirit and . . . let's face it . . . no one else can be Mark Hamill's Joker. The next Joker will need to take the character in a different direction if he wants to make his Joker anywhere near as iconic as Hamill's. Plus, I can't shake the feeling that the Joker from the Brave & the Bold is really just Aku from Samurai Jack in disguise.
Between Spiner and DiMaggio, it's a tough call. The Joker really needs an incredible range, first and foremost, to truly capture the extent of his mania and his variations from grim to goofy. Heath Ledger actually did this well by combining grim and goofy into something that was uniquely disturbing. DiMaggio has the grim down, but he only seems to get the manic goofyness in there with his laugh (which is quite good). Spiner, on the other hand, does a better job with the Joker's goofier side but he just sounds generic when he tries to be grim.
I voted DiMaggio. If DiMaggio can learn to switch it up a bit, beyond swapping between Chicago-mobster-gritty and manic laughter, I think we'd have a winner.
