Personally, I'd just go with the higher-resolution display, if you notice your GPU struggling at that resolution, you can still turn down the render resolution of the game, but you'd still be on a larger monitor.
The larger issue when gaming is probably that some games don't play nice with ultrawide monitors, so your mileage may vary.
So I've been wondering, how do I see if I'm seing a post from a server that's defederated from the instance I'm registered on? Like for example beehaw, which defederated from lemmy.world.
It completely depends on the games you play.
Personally, I'd just go with the higher-resolution display, if you notice your GPU struggling at that resolution, you can still turn down the render resolution of the game, but you'd still be on a larger monitor.
The larger issue when gaming is probably that some games don't play nice with ultrawide monitors, so your mileage may vary.