Borg vs. Optimus Prime (07 film) vs. Megatron (G1) vs. Darth Vader vs. The Master (new Who)

Quite a brain bender, with all these choices. But if all of these were to somehow end up in battle, who do you think would claim victory?
I say the Master. Darth Vader isn't all that great and would probably be the first to go. Prime or Megatron would end up finishing off the other, and the survivor would be assimilated by the Borg. And while the Borg adapt and assimilate, even the classic Master would have found some way of bypassing the adaptation abilities very quickly. So once more I say, the master would claim victory.
I say the Master. Darth Vader isn't all that great and would probably be the first to go. Prime or Megatron would end up finishing off the other, and the survivor would be assimilated by the Borg. And while the Borg adapt and assimilate, even the classic Master would have found some way of bypassing the adaptation abilities very quickly. So once more I say, the master would claim victory.