The most common recommendation would be Chaos since that's where majority of the playerbase is at.
You'll also have access to a way bigger population & economy to interact with over there, but keep in mind that that means more competition too.
Most of the helpful people you find on the forums are chaos-based too. But both servers have their own newbie-helping guilds which you can easily find.
Thor on the otherhand is a pretty chill server, with a small but tight-knit community.
At the end of the day, the content each server gets is still relatively the same.
Although the servers are really different when it comes to population count, what that also means is each server has its own set of problems that might not be the same on the other.
(i.e varying supply & demand for items, competition in hunting/mvp-ing/buying/selling, time it takes to organize parties, etc.)
Bots are still a thing, unfortunately. But be wary of dupe item scammers now too.
They'd need to do a major overhaul of the game if they want to get rid of those.
Edited by ninJedi, 22 June 2019 - 10:23 AM.