Timecop versus Dr. Emmett Brown...

Timecop is tasked with killing Emmett Brown (Back to the Future series.) Doc learns of this and decides to kill Timecop.

Timecop has the full support of the TEC and his funny looking pistol. The hot black chick with the perky **** is also with him. Doc has Marty in tow (for whatever good that will do), the DeLorean (modified as it was at the end of the first BTTF movie), and his rifle from the Old West.

Now, for some reason, it is unclear as to who their parents are/were, records are sketchy. There will be no Terminator bullshit, no going back and killing their parents, no going back and killing them as kids.

So, that said and done, who kills who? Morals off, of course.

Hmmmmmm. I wanna say Timecop...... his methods of travel seem safer and bounded by less restrictions.

There were a lot of paradox dangers and alternate universe issues in BTTF travel.

I'd say Timecop simply because of his training.