Of the three, Power-Horse is the only one I have seen sell. That doesnt mean I see it sell well, but the only one that does have some re-orders. Source Burn, I have seen in stores that buy it from their local cash&carry, and it sits there. Go Fast will eventually sell, after a few years, and then leave their sliders for everyone else to use. Power Horse has used counter top fridges in the field, and plays off Red Bull me-too angle.
Try to make it to the NACS show in Las Vegas next week. You will see more energy drinks than you can shake a stick at.
Before you make a decision consider this: A distributor is responsible for getting a product on the shelf...the manufacturer is responsible for moving it off the shelf. Ask them what they are/will do to promote the brand and get it in the consumers hands.