should I upgrade to an xbox one s/x?

To be clear, did you buy a One S or a Series S? Does it have a disc drive?

You shouldn’t get any upgrade prompts on a One S, X/S games will not run on a One S, if you upgraded the game to the X/S version, so if you have One S, you should decline upgrades

If you want you can upgrade to S or to X but it's not nessesary. Although i upgraded my first xbox one to S back in the time and now on Black Friday i upgraded to X so it's depend on the person i think.

The Xbox One X is absolutely worth it if you want to play games in 4k. The One S only allows you to watch content in 4k, but you can't play any Xbox enhanced games. If you don't own either an S or an X, or own an original Xbox One, I would definitely
recommend the X. If you already own an S, then it's a little harder to push the upgrade. I had the Day One Edition Xbox and upgraded to the S. But once I saw games running in 4k, I upgraded again to the X. Totally worth it in my opinion.

No the series s

With xbox one devices there is no compatibility of s or x or og

It's just xbox one

With one x gets HD upgrades when available

Most modern Monitors will work fine on the Xbox One S. Be aware though that while the One S supports 4K, it doesn't play games in 4K. Games on the One S are in 1080P (or lower and then upscaled).

Are you planning on upgrading to a Series X? If so, you should look at these.