ok I love both of these things but imma go with murder drones. they have futuristic weapons, some can fly, basically telekinesis, and an eldritch horror.
I mean, some of the MD characters will not stand a chance against the TF2 characters but, there are about 5 that can use the solver, and three that are killing machines made to be able to kill anything they need.
So we've got three robots designed to kill anything, three robots with God powers, three normal robots, a clinically insane robot, a "human", a maid robot that's not an Eldritch horror, and an Eldritch horror VS 9 dudes