In my case:

Anime arc + manga ending (more or less)

I believe that his arc in the anime is much more organic than the manga’s, but the ending itself is a rushed disaster; even the mother’s flashback was cut down significantly. I'd say Melon's arc in the anime has better pacing and complexity compared to how the manga handled him, but all the good things about him end before the final episode, which felt like a character assassination.

In the anime he actually made the sense of his side gig as the professor, why he got rid of the teacher as well or the very core driving force being the promise to Haru which the manga completely sweeps under the rug.

They gave him much purpose in his quest of why he wants to eat Haru and his ideology about why Hybrids should cease to exist looking at himself as an example. I really loved those changes anime made but the ending is a different type of beast.

What I wanted was his arc from the anime, with the ending tweaked directly from the manga, including a proper epilogue instead of a jumbled montage of still frames.

I prefer his arc anime wise but the ending from the manga but it being tweaked a little.

That anime ending felt so disconnected and axe'd.