Every biome (except Meadows) have their trolls.
Black Forest - Trolls (weak to pierce)
Swamp - Abominations (weak to fire, slash)
Mountains - Stone Golems (weak to blunt, pick axe)
Plains - Lox (weak to pierce)

And trolls can get you everywhere during "The Ground Shakes" event. Well, anywhere higher than Black Forest, they gonna be killed by the denizens there...

I like Black Forest, Mountains and Meadows to build, because it is just plain beautiful there. Plains are nice as well, but very dangerous.

Edit: Best to build practically and efficiently is probably Meadows and Plains. But then you also got to haul your ore there, so you probably have at least a small base in the Black Forest for pretty much all ores that this biome borders at.

I have built my largest base, a tavern, in the meadows. One side of the base (and it is not THAT large) borders Black Forest, the other side borders Plains. That Meadows biome is very small where it ends at the sea.

The fourth side borders Meadows and not far away Mountains. Additionally there's a Swamp nearby. So I got all biomes very close by (or literally at my doorstep). Suffice it to say, this base is excellent for gathering and processing ore.