User blog comment:Legionwrex/Spectre vs Spartan II/@comment-1388547-20121223044240

Well, I think this whole discussion is a bit silly, but I'm feeling silly right now too, so here goes. Ground rules: I'm going to ignore all novels and external supporting material, and focus solely on what happens in the games themselves.

I think it all boils down to how the combat mechanics interact, and what kind of Spectre we're dealing with. In Halo, Spartans generally feel much tougher than Shepard or ME3 MP characters, so I'd say a prepared Spartan would probably win versus a Soldier-type Spectre. If Spartan shields block biotics, it would be a tough fight for a biotic Spectre, but once the shields are down the Spectre would incapacitate the Spartan and win easily, so it's down to whether the Spectre can bring down the Spartan's shields down quickly enough. If the MJOLNIR armor counts as armor in the ME3 sense, a biotic Spectre is in trouble, and had better have Warp or Reave. A tech-oriented Spectre might be in the best shape, if Overload or Energy Drain works on Spartan shields. Bring down the shields, then see if the Spartan can be stunned by tech powers. If anti-shield tech powers don't work on Spartans, the situation is much more problematic. A combat drone might also be an invaluable aid to a tech Spectre -- particularly an exploding one.

I will in general say that while weapon and armor technologies seem more effective in the Halo universe, Spartans have a lot fewer abilities that aren't directly related to shooting things or surviving enemy weapons fire than characters in the Mass Effect universe. I can't really draw conclusions directly from that as to who would win in a fight, but I'd say that if the Spartan doesn't win quickly, the Spectre will probably win in a longer fight due to their greater versatility.