Still Mario. It wouldn't have mattered if Pokemon was even more successful than it actually was in the 90s.
Mario is Miyamoto's baby. That's his Mickey Mouse while he's Walt Disney. At best they'd be co-Mascots. But they would still prioritize Mario in the advertising.
Hardware Comparison Threads:
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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
PlayStation 4/Xbox One/Nintendo Switch: 2018 vs. 2019
PlayStation 4/Xbox One/Nintendo Switch: 2017 vs. 2018
PlayStation 4: 2015 vs. 2016 vs. 2017