not a movie person and haven't seen any of them (no not even heard of them) so I can only judge by the trailers...
first one I had to turn off after 15 seconds... movies related to Christmas or saint nicolas make me puke second one looked boring at first but then with the books it got interesting... could imagine it being fun to watch third one looked most interesting at first but then when I saw it's moby dick it was just... meh. not my cup of tea but still interesting looking
I guess this doesn't help you at all but at least I got xp 👍
Krampus is directed by Michael Dougherty who also wrote and directed Trick 'r Treat which was kinda awesome. So my money is on that one. But Goosebumps was pretty good from what I have heard, I want to watch both personally.
In the Heart of the Sea doesn't look bad, but since the story is so well known it doesn't really interest me that much.
I work at a movie theater and from the ticket sales and glimpses of films I'd say go with Krampus. Goosebumps is pretty funny too, but if I were to choose I would pick the first one. Or you could see them all.