Actually, I like the Mountain biome for the ambience too. During a blizzard, it's so awesome.

When standing atop the mountain, a high one, to be able to see far and wide is quite lovely. I am looking forward to the game's official release in 3-4 years. I hope by then, the visuals are much more refined and optimised.

However, on the same wavelength, I love the Black Forest during sunset and sunrise when not raining. The sun beams are so beautiful through the trees.

Oh, make sure not to explore the cold north and hot south yet. They are void of content. Well, unless you intend to start a new world when they are filled.