Depends on your GPU manufacturer. OGL seems faster for a lot of AMD cards (not mine, though I'm not complaining since I can play LoZ:WW full speed on both backends with 4xIR), but, iirc, there's a bug with newer NVidia drivers that makes OGL go hellishly slow, apparently.
in a perfect world we would all be piles of sand with no ability to form coherent bodies of body