It sounds to me like you know your anwser.

The series X offers you not only future titles from your favourite franchise but previous ones all playable on one console with enhancements.

The cost saving between ultimate and game share will save you a small fortune alone, you love Forza etc

To me it sounds like your heart is settled on the series X - not a bad thing at all I love my SX!

I’m in a some what similar boat and the SX leaves me with no regrets and has already saved me a fortune.