What are the advantages of Sylvan archers compared to Master Archers?

If you think about it, the damage output is the same. Two shots at a spellcasting enemy with luck can be quite effective, and you can even take down a Phantom if you really need to, or Ghosts if that's what you need to do. So, Masters also have decent damage and abilities... and the whole point of the Archer's Dream artifacts is in them!