Yep, distrobox is a wrapper for Podman, which is also installed by default.

But I agree, there’s actually not a ton of functional difference between SteamOS and Bazzite, unless you want/need to use your Deck like a laptop. If you are only doing gaming, SteamOS is actually the better choice, because Valve has patches and modifications that aren’t yet included in upstream that maximize the hardware’s capabilities and stability.