the original five for sure! they are so heavily infused with nostalgia for me, but even beyond that, i think they have the strongest messaging and theme. definitely a lot of bias there because i’ve only finished percy jackson and the olympians & heroes of olympus in full.
i honestly can’t remember magnus chase. the first kane chronicles book was fun though, and i’d like to continue it (eventually). i also read the first senior year adventures book and think it’s better than hoo so far. i also tried reading trials of apollo but i couldn't get into the characters/writing.