IMHO.

Warhammer 40,000: Armageddon (Classic) vs Warhammer 40,000: Gladius - Relics of War

Warhammer 40,000: Armageddon (Classic) and Warhammer 40,000: Gladius - Relics of War both land in Strategy on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both are Strategy games on Steam. Warhammer 40,000: Armageddon (Classic) (2014) is 4 years older than Warhammer 40,000: Gladius - Relics of War (2018). Warhammer 40,000: Armageddon (Classic) scores higher on Steam reviews (83.2% positive) than Warhammer 40,000: Gladius - Relics of War (81.9% positive). No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.

Which should you pick?

Choose Warhammer 40,000: Armageddon (Classic)

Choose Warhammer 40,000: Armageddon (Classic) if it's currently about 50% cheaper on the Steam Store. Warhammer 40,000: Armageddon (Classic) launched in 2014.

Choose Warhammer 40,000: Gladius - Relics of War

Choose Warhammer 40,000: Gladius - Relics of War if you want the Shared/Split Screen, Online PvP, and Shared/Split Screen PvP side of the pairing. On Steam, it's the newer release (2018) and ships with the modern feature baseline. 5,122 Steam reviews back the pick.

Both Warhammer 40,000: Armageddon (Classic) and Warhammer 40,000: Gladius - Relics of War sit in Strategy on Steam and both list Multi-player, so either pick lands in the same broad neighborhood. Steam reviews are nearly tied (83.2% vs 81.9% positive), so genre fit is the cleanest tiebreaker — scroll the table for the feature-by-feature view.

Side-by-side comparison

Warhammer 40,000: Armageddon (Classic) vs Warhammer 40,000: Gladius - Relics of War — Steam metadata comparison
Warhammer 40,000: Armageddon (Classic) — Steam game coverWarhammer 40,000: Armageddon (Classic)Warhammer 40,000: Gladius - Relics of War — Steam game coverWarhammer 40,000: Gladius - Relics of War
Released20142018
GenresStrategyStrategy
PlatformsWindowsWindows, Linux
Steam DeckDeck PlayableDeck Playable
Price19.99 USD39.99 USD
Steam reviews83.2% positive (643 reviews)81.9% positive (5,122 reviews)
MultiplayerMulti-player, Cross-Platform MultiplayerMulti-player, Cross-Platform Multiplayer, Online Co-op
DevelopersFlashback Games, The Lordz Games StudioProxy Studios

Side by side

Warhammer 40,000: Armageddon (Classic) vs Warhammer 40,000: Gladius - Relics of War — FAQ

Which is better, Warhammer 40,000: Armageddon (Classic) or Warhammer 40,000: Gladius - Relics of War?
On Steam reviews the two are nearly tied: Warhammer 40,000: Armageddon (Classic) sits at 83.2% positive (643 reviews), Warhammer 40,000: Gladius - Relics of War at 81.9% (5,122). The choice usually comes down to genre fit and the platform features each one supports — see the comparison table above.
Should I play Warhammer 40,000: Armageddon (Classic) or Warhammer 40,000: Gladius - Relics of War first?
If you want chronology, Warhammer 40,000: Armageddon (Classic) (2014) came out before Warhammer 40,000: Gladius - Relics of War (2018). If neither is a sequel to the other, order doesn't really matter — start with whichever fits your current mood, since both share enough on Steam to make either a reasonable opener.
Are Warhammer 40,000: Armageddon (Classic) and Warhammer 40,000: Gladius - Relics of War similar?
They overlap on Strategy on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.