I prefer Playstation to Xbox, but even before Ninty and MS started their heavy flirting, I would've preferred Microsoft characters in Smash to Sony ones. I feel like a lot of Sony's characters are more conducive to a Marvel vs. Capcom kind of crossover, whereas MS's are more conducive to Smash.
I was sitting lonely on the Banjo train before that Spencer tweet, and jumped on the Master Chief train when it was mostly only rode for irony, pre-Ultimate. Cuphead and Gears would also be neat. And ofc other Rare stuff. And then there's Steve.
That said, there are Sony characters that'd be alright in Smash. Jak & Daxter, Ratchet and Clank, Sly Cooper. Sackboy would fit. Kat is cool. But those aren't the ones you'd actually see get included.