Don't listen to the snobs saying that the UK version is better than the US version, they're both amazing in their own ways. The UK version was awesome but had a sadder tone to it overall, and honestly I loved the caveman but replacing him with Thorfinn in the US version made the show more rounded. The UK version also mostly having old ghosts didn't make sense in retrospect.
The US version is just brighter in both color grading, story, and message. I'm honestly loving it!