Batman would win. If he's got all the Kryptonite he wants he'd just sneak into the Fortress of Solitude while Superman was out and plant Kryptonite in his food and water, then kill Superman with a giant strap-on made of Kryptonite.
English
-
Lol. Batman can't sneak into the Fortress.
-
He did in Batman Beyond. Although that technically wasn't Batman.
-
It also wasn't canon.