I have both Don't Stave Together (DST) and Valheim, they're both fundamentally different games.

Yes the premise may be the say, Loot Build Survive, but they run entirely different regardless of the aspect you play in, 3D vs 2D.

In DST, it's a permanent ongoing play. There's no pausing, there's no saving and coming back later as it was, and in most cases death is absolute. In some servers the played DAYS reach 500(Ingame)Days, which is something like 3weeks of continuous nonstop play from the Players. Also your Character is tied to that Server. You cannot AFK as you could starve to death.

In Valheim, it's mostly solo play, and you can come and go as you please. There aren't really Community Servers, as most people play privately with friends to prevent griefing from bad-apples looking to steal your hard fought goods and ruin your hard work. Valheim is more like a Casual Dark Souls. Items are mostly easily replaceable and it's very easy to have a surplus when playing with friends. Your character is free to Server hop. You can AFK if you know how.