Interestingly, you cannot tell which soda this ad is ostensibly promoting until the very end.
Here’s a question for ya: Can you remember ever going into any eating establishment — a diner, a fast-food joint, nice white-cloth restaurant — where both Coke and Pepsi were on the menu? I can’t. It’s always only just one of them… because they lock in vendors so that patrons cannot have the sort of choice the guys depicted here get.