I've completed the UK version and I'm about halfway through the US version. Let me just say I think both versions of the show are very good. Just all around good TV. I personally love Werewolf and this is a great adaptation.

* The missions where they build the money pot are worthless and not entertaining to watch. They so far have been exactly the same between the two versions and you might as well fast forward through them.
* I really don't like that they added the reality show stars instead of just normal people. A game like this needs big personalities, but they didn't need the stars. For the most part the non-reality show stars might as well not even be on the show with how much attention they get. The non-reality show stars are present, but there's no question that this is the reality show stars show.
* Alan Cumming is a treasure. I love Claudia Winkleman to death, but Alan is just great.
* This version is way more overproduced than the UK version and I'm not super impressed with it. I also highly suspect this version has producers throwing wrenches into the mix to spice things up (more on that in the spoiler section).
* The UK version everyone is very nice to each other and nobody wants to be a traitor. As a whole, they're a lot worse at Werewolf. The US version appears to be much more cutthroat and everyone wants to be a traitor. As a whole, they appear to be better at Werewolf. Both of these groups are fun to watch.

[spoiler]In an early episode one of the reality show stars just perfectly drops a note that immediately throws the house into chaos. This just screams a producer told her to do that and cheapens the show. You just know one producer thought they had to make things interesting and meddle so these big personalities could do exactly what they brought them there to do.[/spoiler]

All in all I think I like that this group is better than Werewolf, I just don't like the reality show stars. If they do a season 2 I hope they don't do that again.

-edit

Ok, now having finished both I have more thoughts I think:

* A game like this works best when it does have big personalities and the reality stars help that, that said, I still don't like that the reality stars were even in the game. They could find big personalities without having the reality stars, I hope the second season doesn't include them.
* For the most part, the non-reality show players might as well not even be there. They're in the game, but it's the reality stars game. It's about them and the non-reality stars are just side players for the most part.
* [spoiler]Cyrie played a pretty amazing game. She did great.[/spoiler]
* [spoiler]Quentin was hilariously wrong at every single point in the game. Like people get things wrong in Werewolf but even bad player accidentally get some things right. He never made a single good call in the entire series and made it worse because he was so smug about his gut feelings.[/spoiler]
* [spoiler]Christian was such an awful traitor. His acting surprised every morning would have made B movie actors cringe, I don't know how he kept going under the radar. I'm glad the other two traitors worked together to boot him out because he was pretty much already counting his money and was just getting more and more obnoxious with each episode.[/spoiler]

* [spoiler]Kate kind of pissed me off because she kept saying she didn't want to be there and was derailing the game. These are the worst people to play werewolf with. I don't know how much of an act it was, but she sucked.[/spoiler]
* [spoiler]I was 100% sure in the end the two remaining reality stars were going to throw the game to let the non-reality stars win. That totally still seems like a thing a reality show producer would rig as a feel good moment. That was a pretty nuts gambit Cyrie pulled.[/spoiler]
* I still don't know what happens when there's a tie in votes after watching the US and UK versions. [spoiler]When it got down to 2 traitors and 2 failthfuls at the end, that would be instant game over in werewolf. In this, I have no idea.[/spoiler]
* Alan Cumming, still a treasure.
* Missions, still the worst part of the show.
* I laughed that they got rid of the "kiss of death" murder, that one did seem pretty problematic. I was wondering how they were going to handle it, I guess the answer was to just remove it.
* The shields still seem totally pointless because the traitors just have too much info to make them worthwhile [spoiler]even with the same guy winning the shield every single time[/spoiler].

All-in-all, great show. I don't know which version I like better, doesn't really matter since I'll keep watching both.