Well who played both servers will see difference. I recommend both servers, but I want to be honest and give real point of view.
Monster behavior is different on Nostalther.
There are many details on map.
There are prolly still bugs to be found.
Well Tibiantis have best formulas on everything. Monsters react like I remember it in rl tibia. There are no bugs like for example: monsters flee into field items and die
But well:
1) Fresh server is always fun
2) Nostalther has ankrahmun and port hope what gives a lot of new places to hunt
3) Community on Nostalther is different, mainly they are other people then on Tibiantis. So again something new.
Lamusini