Best chief engineer? Scott since he could keep the engines running, fix whatever problem, invent transwarp beaming, use an 80's computer to draw up the formula for transparent aluminium and step into the captain's chair when required.
O'Brien gets seond place for MacGyvering DS9 together.
LaForge third, the man keep up with and can do a killer under door roll.
Trip fourth, if anything he was better in command than his captain.
Torres fifth, has a few Maquis tricks up her sleeve.
Stamets sixth, 'shrooms.