I would view it as Bret as the better "wrestler" but Cena having the better career and longer highlight reel. Don't begrudge anyone for preferring Bret even if his actual career feels more like a "could've been". It's like how, in hip-hop, Biggie is generally picked over Jay-Z by consensus even with a huge disparity in output between the two. Personally I tend to be more drawn to the wrestlers who peak really highly even if they burn out quickly or lose the spark than the "consistently very good but never outlier great" wrestlers (not that Cena counts as the latter, his peak is awesome and understandable if it was preferred to Bret's).