Most people will tell you that O is the best Cirque du Soleil show in Las Vegas. Well, I think that depends on what you are looking for. It is certainly the most romantic. I enjoyed KA very much because it has a more defined story line and I love how whimsical the Love show is. I did not enjoy Mystere but I think that one is more geared towards kids. If you want just pure grace and beauty then O is the one for you. I loved every minute of it.