Due to the infinitely convoluted paradox of a time line that is the Terminator franchise these days, the Rev-9 and the T-3000 are both sent back in time. Dropped in the year 2020, the Rev-9 thinks it's mission is to kill John Conner, aka the T-3000. And the T-3000 thinks it's mission is to kill anything that might threaten it, including the Rev-9.
So with these two latest and most advanced Terminators hunting each other, which one wins?