Manga-Based:
Whodunnit: The spider mansion, the Kiritengu, the arcade case, the glove of sadness, the four porsches, the Torn Friendship story from volume 39, and the Kappa Conundrum
Howdunnit: The course without protest, the illustrator case form volume 13, the case with the couple when Eisuke was introduced, and the Missing watch case.
Open mystery: Kaito Kid's Air walk, the story in the school when Kobayashi was introduced, and the first case in Ai's introduction with the kidnapped kid.
Easiest to solve case overall: Most of the early DB chapters.
Hardest case to solve overall: For me, it's the Without Protest case with the baseball star.
Anime Original:
Whodunnit: The vampire villa case, the fishing tournament, the Anger of the Collossus, and the Cursed Mask murder.
Howdunnit: The train trick, the one where a women's stalker was killed.
Open mystery: The secret of the high sales, mainly for the ending
Overall easiest case to solve: Can't really decide, a lot of the AOs are rather simplistic.
Hardest case to solve overall: the Cursed Mask case.
