Your favorite of the Unlock! games

This is a question for those of you who have played the Unlock! games.

I've recently been in an escape room obsession and I thought that these games might be worth investing in to get my fix. Right now, I'm set on trying one of the Exit games (I've decided on the cabin) and one of the Unlock! games. Unfortunately, I'm torn on which of the Unlock! versions to get.

Which one was your favorite and (without spoilers) why? Maybe it was a mix of the difficulty and creativity of the puzzles or it was the story.