system
Given the following post, respond as if you're commenting on Reddit:
human
[W40K/Halo] How does a space marine match up against a Spartan? [xpost whowouldwin]

For simplicity lets say its a battlebrother from a codex chapter against a Spartan other than MC.
gpt
The Warhammer Space-Marine wins. 

It's not to say that Spartans are weak or anything, but Spartans are designed to eventually become veterans; To eventually have a life and purpose that doesn't directly involve murdering aliens.

Codex Adherent Space-Marines are not. There are no Space-Marine veterans; There are only Space Marines with more combat experience.