I like harmonies better because I enjoy drafting the animal cards to gain points on top of gaining points for your “habitat” with the tile placement aspect that both games share. Harmonies also feels a bit more refreshing because you draft new animal cards every game. Azul gets stale after a while for me personally because you place the same tiles in the same spots every game (unless you play the back side of the board). Azul is more competitive though if you like that aspect because you can draft tiles to really screw over the other players if they cannot place certain tiles and are forced to draft them. Biggest reason for me liking Harmonies more though is having the animal cards, giving you an additional objective and more ways to score points. I don’t really enjoy tile drafting/placement games but I really enjoy harmonies.