IMO, if WB wants an animated rotoscoped Superman film in the style of the old animated Superman shorts, then Richard Linklater would do a great job despite the fact rotoscoping takes a strong effort and a long time to complete because rotoscoping is a complex form of animation.
As for other directors, James Mangold could do a great job making a great Superman movie especially after he did The Wolverine and Logan because both films caught many people off-guard given the excellent quality of both films.
If not, WB should consider Sam Raimi or Guillermo Del Toro.
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Silly NTs, I have Aspergers, and having Aspergers is gr-r-reat!