Hmm hand to hand I'd go with the zealot because they can take a couple of tank shells and still keep coming. They also have strong wepons that are just as potent as chiefs energy sword. If chief gets his guns than it might be closer but the zealot can take a lot of bullets so chief might run out and then he is dead. Overall I go with the zealot because his shields are stronger his blades are just as as strong as a plasma sword and he can run really fast.