I'd say the tiebreaker would be software sales. Which platform was the healthier or more fruitful/lucrative for developers to make games for.
And if THAT is tied (Because the PS2 is at 1.537 billion software sales, Switch is at 1.306 billion, so it's getting close THERE too!!!) then the 2nd tie-breaker I'd say would be which system was the more profitable for their company. In which case, the Switch would be the winner because the amount of money and profits Nintendo has made off this system DWARFS the amount they made off the Wii/DS era let alone the amount Sony made off the PS2.
Hardware Comparison Threads:
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Is Hardware Getting TOO Powerful?
Older Threads:
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