I'd still choose Xbox any day not degrading ps4 or anything. I just like the interface better. And I've played both. I don't see any better perfornance in ps4.
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I can't stand the xbox ui.. It's just a windows 8 clone with ads shoved in. And yeah you won't see performance differences because everything is tweaked to run at the best settings the system can handle without lag.. So they'll each run everything fine, the ps4 will just usually have higher frame rate or better graphics with higher res textures.