Thulecite club has perks that make it much better and it's more durable, but the tentacle spike is easily the best weapon in the early and mid-game.
Thulecite gear is excellent, but you have to go to the ruins to get it. Good luck with that quest. You have to explore the caves enough to find an entrance to the ruins, basically a cave withing a cave.

Ex-girlfriend is right on. I started this thread after rage quitting daily for weeks. Gotta love a game that is challenging enough to do that over and over.