I think Nintendo will be on top for the next two years since the PS5 won't likely release until Q4 2020, by then it'll be too little, too late. 2021 though...
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PlayStation/Xbox/Switch: 2022 Edition
PlayStation/Xbox/Switch Hardware Battle: 2021 Edition!
PlayStation 4/Xbox One/Nintendo Switch: 2019 vs. 2020
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PlayStation 4: 2015 vs. 2016 vs. 2017