Which of the following flavors is best served on the rocks?

The flavor best served on the rocks is Razzlesnake. This option is known for its vibrant and bold taste, which pairs well with the ice's cooling effect. Serving Razzlesnake on the rocks enhances its fruity and refreshing qualities, making it particularly enjoyable, especially in warmer settings or during summer months when a chilled drink is more appealing.

When considering the other flavors, Strawberry, Coconut, and Peach can also be delicious but may not carry the same level of complexity and unexpected flavor profiles that Razzlesnake does. Strawberry often lends itself to being blended or served frozen for a smooth texture, while Coconut typically features in tropical cocktails that might be better suited for blended drinks. Peach, while refreshing, can also be enjoyed in various styles but doesn't have the same layered flavors that the Razzlesnake offers when served chilled on the rocks.