What's the difference between Terraforming Mars and Ares Expedition?

Ares Expedition is the streamlined card-game version. Across r/boardgames discussion, players note Ares plays in 45–60 minutes versus 90–120+ for the original, uses a simultaneous-action card system instead of a hex map, and includes a co-op mode. Reviewers who prize the original's tile placement tend to prefer the base game; those who want a faster engine-builder lean toward Ares.