The cost of both the products are $2 per can but the quantity of Monster is just double than that of Red Bull. Rockstar: This competitive energy drink whose motto is "party like a Rockstar", targeted at the younger consumers who want to be "wild and crazy" and spend all night dancing. There are a number of flavors of Rockstar - cola, energy drink, and juiced. The energy drink is similar in taste to all the others, whereas the cola product has the best taste. The juiced version is said to be 70% real fruit juice and 100% energy. They were the first to use the 16oz larger size, and this has fixed and become the standard. Only Red Bull continues to market the smaller cans, which is part of their image.