I haven't tasted all of the monsters yet since I drink it only when I need to stay up and don't feel like drinking coffee. I've had so far the watermelon one, the mango loco, sugar free and the original flavor. I can definitely say my favorite is the sugarless one, I don't know why but for some reason it tastes better than all of them... Maybe it's the color of the bottle its in or something I really can't tell why I like it so much T-T welp, I can say that it's definitely the superior monster flavor.