@AFresherPerspective Blandness aside, I am not really talking about preference here. Its more about "What can you do with these guys."
If you have an OP guy who is not shy of being OP, then for any "story", you need an "OP" opponent. Bigwigs basically, aside from starter villains. Not only does this become a scaling issue like Dragon Ball (Wuxia stories can end up with planets exploding battles. Yes. Plural). Everything basically ends up with violence... of the explosive variety and very VERY stupid villains. Like beyond braindead levels of stupid. Its why you have "Random aliens attacking Earth". Its because "Earth" literally ran out of opponents and Goku learning driving or Saitama doing supermarket is worth less than 1 episode.
Arnos for one is just a cocky dude with every BS spell under his book. He gets two waifus who is pretty much sidelined in favor of his opponents after their respective arcs. All their characteristics pretty much went down the drain and they become something like generic "Elite Mooks" where said "Mooks" are one of Arnos obnoxious singing fangirls. No matter how much you like Arnos or his series, Arnos is pretty much the main reason his series is well... BAD (looking through the comments I also see several people say "It's so bad its good"/ "Golden trash"/ etc. That's definitely not a compliment from someone who LIKES the thing. So I can claim from a relatively neutral standpoint that its "bad" even to people that like it.)
Now I am not saying that writing a good story with such characters is impossible or that the reverse is will definitely be good. However, the moment you put an OP cocky guy as a main protagonist, the flexibility of the plot is pretty much gone, making the story that much harder to write well.