Ardour is not as focused on "in the box composition" (i.e. making music entirely on your computer) as Live or Bitwig are. It originated as something closer to ProTools or Logic or Digital Performer in the sense that it was focused on recording people doing stuff (blowing,hitting,singing,speaker,scraping etc. etc).

However, in recent years, we've added a lot of the stuff you need for "in the box composition" and many people do use it that way. There's (always) more to do, but it's fairly capable in this sort of workflow now too and will continue to improve over time.

Ardour has been around for more than 25 years.

Please be aware that almost any fully-capable DAW (everything named here except lmms) has a steep, challenging learning curve. Don't jump in thinking it will be easy.