To be 100% honest I never thought of Metal Arc as the, "best," moderator. He was a good moderator, but certainly not the best, and I have seen many better.
To be honest, and no offense to anyone else, I consider Fox the best moderator on the site, although they are all equally worthy of the position. Maybe Wist will surprise me, I wouldn't doubt it either, as I've seen Wist around the site.