X.
Or used S as they are quite cheap because they arent popular*, I have seen them going for about 200€ and few times under it.
X = disc drive = it is backwards compatible, unlike S. (I dont count digital titles as real compatibility)
X = bigger SSD, even this 1tb disc fills up really fast, like install flight simulator + forza5 + halo = around 250gb gone
X = more performance now and in the future, S is just too weak to not to be a compromise
XXX.
S is smaller and cheaper, but saving so little isnt worth it, unless you are on really low budget, and then getting new console should not be your thing then anyway.
If you are planning to get game pass, then S with tiny SSD will became annoying really soon, as it limits the ability to test random games, unless you delete games all the time. On X it is already annoing as the disc feels small. and buyinh extra storage for S makes it more expensive than getting X.
Game pass with gold -> 1€$ -> game pass ultimate conversion deal is really good
Game pass with 15-16€ / month normal price is just a "rip off", unless you game only on xbox + game hours/day, it is not worth it.
with normal price it is about 192€/year, or 576 € for 3 years.
With that money you can get 3-4 launch games/year, or 5-20 games/year when buying from sales and used games. Or if you buy disc games, complete them in some weeks, you can then sell them for 10-30€ loss and play even more launch games/year, with console that uses discs.
Because time is limited, it is not worth it unless you really play like 10-50h/week + play more than 5-10 games/year.
And I am not counting situations, where you have to buy games that are not coming in game pass, or have already left it, it also adds up.
But with 1€ conversion deal it is damn good deal.
Normal price is basically like having netflix+hbo+disney+ on the same time == there is no way one person have enough time to really use them all, unless only thing they do is to watch tv.
As in if you own ps5/pc/switch and then get xbox = now you have to divide your gaming time even more, so game pass will lose some of it's glory vs. if you only own xbox.
But in the end series x is nice system and with cheap game pass it is really good deal to own and I highly recomend it. Just save a bit more and get series x, it is much more future proof than S, which is also great machine for some situations, but probably not to yours.
* yes yes they are sold out and cost your first born and sould at US, but on many countries they have been available since the launch quite easily. Even series X have been on stores for weeks, or maybe a month before it sold out again here.