>>538254The anime: never got a proper ending, has a bunch of boring fillers, character designs look ugly and off-model most of the time, the humor is too exaggerated and gets annoying after the first episode.
The manga: has an actual ending, has more character development, all of the girls always look cute, the humor isn't as in-your-face as the anime.
You can watch the anime if you want to, it has a few good original episodes, but you need to finish the manga first.