yea i still dont know if theres any difference to the S and X other than 4k lmao
Besides 4K, the Series S has roughly half the hard drive space, so having multiple games installed can be tricky, especially for larger games like Starfield will probably be. You can always buy an extra storage card for your S, but at that point, you're already losing most of your cost benefit of going with the S in the first place. If you plan on keeping a decent amount of games installed, the X might just be a more convenient starting place.
Obviously due to being a less powerful machine, you're not going to get 4K out of it, but you're also even more at the mercy of the developer when it comes to framerates. Some devs are great at finding a way to get a consistent 60/30 out of the Series S, and some aren't. You're also likely going to see the little annoying stuff that people nitpick about like pop-in, textures occasionally looking off, etc. Again, that's more about how the dev handles it, but realistically speaking, most are developing for the Series X as the lead Microsoft platform, and then essentially working their way back to the Series S.
Unfortunately, with the nature of reviews, most times the Series X code is sent to reviewers first (or sometimes only) if an outlet is specifically looking to review a game on XBox, so there's more of a "wait for real world reviews" element if you're trying to decode between buying on multiple platforms.
Using myself as the example, I've got a PS5, so I just got a Series X so my decision on what platform to buy something on is a bit easier, since they're close to each other on feature parity.