It's the battle of the energy drink investments. Is Celsius Holdings or Monster Beverage the better bet on caffeinated beverages right now? Started as a Californian fruit juice company in 1934, Monster Beverage (MNST 2.51%) has been around the block a few times. The company tapped into energy drinks when they were new and fresh, dropping the fruit juice focus along the way. Health-conscious energy drink rival Celsius Holdings (CELH -1.49%) feels like a fresher face, particularly in terms of building a large ...