Azul is 2-4 player. My grandson and I played a 2 player game before the girls joined us. It was quite fun and much more cut-throat than the 4 player game as you can more easily predict which tiles will be taken during the last few moves before refilling the factories and have the possibility of forcing your opponent to take some large negative draws.Azul was a neato game. But I liked it more than my wife, and it's four player only, so I'm not sure I'll be buying it.
If you like Azul, I recommend Sagrada (which I think I mentioned previously). Colorful game, puzzle centric. Less cross-player interactions compared to Azul, I think.
I've looked at Sagrada before and have it in my wish lists. It's dazzling to look at and the game play appears to be similar, yet different, to that in Azul. Now that I've played Azul I'm going to look at Sagrada again as I'll be more able to discern the differences.