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Honestly a tie is the best way to interpret it, Incineroar got the corporate backing which is why it got the Smash spot and the anime and is broken in VCG but the Rowlet line's enduring popularity ensured Decidueye getting more appearances in the long run, though nothing as notable as a playable role in Smash Bros.
In the end, both Pokemon have plenty to their name, especially compared to the starters of other generations. Looking forward to playing the owl in Unite.