When comparing Fairy Tail vs One Punch Man, the Slant community recommends One Punch Man for most people. In the question“What are the best animes to watch?” One Punch Man is ranked 15th while Fairy Tail is ranked 21st. The most important reason people chose One Punch Man is:
This show tries to hit as many amine hero cliches as possible, giving it it's own unique feel.
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Pros
Pro Had an ending
Unlike some of the other more popular shows out there, this one (despite being fairly lengthy) does actually conclude, and with a (arguably) satisfying ending at that.
Pro Almost no filler
For a long time this show maintained a good pace with the manga. Later in the series a few episodes and an arc of filler were added, likely to stall for time.
Pro Parody of the superhero genre
This show tries to hit as many amine hero cliches as possible, giving it it's own unique feel.
Pro A legend in his own right
Cons
Con Boring story
Whenever a villain appears, all the heroes gets beaten badly but just after the heroes are beaten, Saitama appears out of nowhere & beats the villain. Nothing special about this.
Con Light on plot
Unlike many popular anime, this one doesn't play into insane backstory and plot twists. This may be a turn off to those looking for a more story-driven experience.
Con Bad graphics
It has oversimplified animation.
Con Superhero genre
Parody or not, superhero genre is boring from it's begining.
Con Very predictable
The story is always simple and predictable taking away the thrill of any fights in the show.