Romero was the original choice for the first movie but they wanted something a bit more... marketable?
As for a personal choice I would've gone with Snyder since Dawn of the Dead was a pretty good remake but I doubt he'd have the time, what with the DC films being so high profile it might send the wrong idea as to the content of the film. I guess if I had to I'd go with a horror director, someone like James Wan or John Carpenter.