Honestly, I like more bad endings than good ones. Obviously a happy ending is always well appreciated but I enjoy seeing one ot the LIs completely destroyed because the death of the heroines or lost in craziness, or crying ️.
For me, bad endings tend to be "cooler" because they're usually different, since the expectation for good endings is always the characters living happily ever after. Like, you kind of know what's coming for a good ending! So, bad endings are usually more surprising.
I don't like bad endings, and I really don't like the trend in media (not in otome in particular, an overall trend in eastern and western media imo) in the last decades to give sad/bad endings because it's more ~realistic~ and ~mature~. It just feels like a bad writer's way out, when they write themselves into a corner and they can't think of a good way to give a happy ending to their characters/a satisfying/cathartic way to finish their story.
(This is just my opinion, everyone should write and read whatever endings they enjoy ).