Yeah I bought AC Origins and Far Cry 5 (both digital) on my X whereas I would have previously played them on Pro. I still played COD WW2 on Pro though, I think PSN had some deal where it got DLCs 30 days earlier or something so thats always something to keep an eye on. Destiny 2 as well I've been playing on Pro due to exclusive stuff.
There honestly aren't that many multi plats that I find interesting this year though, red dead redemption 2 is the big one. Right now I've got it pre ordered on PS4 Pro but I'll probably change to X once the dust settles at E3. I've found Far Cry 5 kinda disappointing after 20 hours into it, all these Ubi games tend to feel same-y after a while so I'm not sure how much hype I'll have for their pirate game, Watch Dogs 3, Division 2, etc.
The games I'm honestly most excited for the rest of the year though are still PS4 exclusives like Spiderman, TLOU 2, Days Gone, etc. Still haven't installed Yakuza 6.
I'm not a super loyal fan either way though, if Sony would release a PS4 Super Pro (lol) or something that matched the X specs I'd switch back to that. I also have a PC but its pretty much only a fortnite/pubg/battlefield/VR system, I prefer single player games on console for trade value, trophies, etc.