Ruins is generally better as it gets back Plating and Ravager but Stronghold gets back most of the things you want as well as some of the really spicy creatures like Welder and Disciple
Its focus is split between Location synergy, Evasives, Challenging-matters, and controlling the board through exerting , while also thematically operating as a mix between Frozen and Wreck-It Ralph characters
They take turns casting spells and using abilities
Youre usually going to use it to just get rid of the biggest threat on the board, but the fact that it can be used in other ways really helps the utility of this card in Commander
If you have the biggest creature(s) in play and need to clear the chump blockers out, just make sure you have enough cards in hand to clear the weaklings out
Dina, Soul Steeper is another great Life-gain commander, especially if white doesnt appeal to you