Druid most definitely. I play almost exclusively druids and rangers in most games. I just love nature oriented classes.
I am also really curious in how they'll implement the druid wildshape mechanic. I am hoping it'll be pretty faithful to 5e, but obviously they can't possibly have the sheer breadth of options that pen and paper allow, so what forms are added will make or break it.
If we just get bears, wolves, cats, and other such creatures I'll be pretty disappointed. I hope we'll have some more exotic options like crocodiles and giant snakes. And a fair few out-of-combat shapes like small birds and rats with their own unique ability to explore the map. Druids are fantastic at the exploration side of DnD and I'd want that to be consistent in Baldur's Gate 3 too.
It'd be interesting if we could like... Choose a couple forms to begin with at character creation, then need to see new forms in-game as we play to unlock a bigger roster. Or maybe tie the wildshapes you start with to your race and what animals they might see in their local region. Something to make beginning as an elven druid distinct from a half-orc or dwarf druid as the environments you came from would be quite different.