It’s a lot more fully featured. It’s allows for a lot more complex mixing and editing. It supports a lot more plugins including virtual instruments. Audacity is good for basic recording and mixing but Ardour takes it to the next level in terms of versatility and control.
If you are interested in audio engineering I would recommend Ardour.
How does this compare to audacity?
It’s a lot more fully featured. It’s allows for a lot more complex mixing and editing. It supports a lot more plugins including virtual instruments. Audacity is good for basic recording and mixing but Ardour takes it to the next level in terms of versatility and control.
I’ve also heard good things about bitwig, though it’s not FOSS, annoyingly.