When Pepsi Challenge was a yuge "trending" deal (way before stuff trended or went viral but same thing) I always chose Coke.
They did it at Knott's Berry Farm where the krewe I was in basically LIVED cuz we had more Ticket Books (which included entry to the park) than we could ever use cuz back then if you presented 2 labels off of Knott's Fruit Punch Concentrate which was sold in stores 2 labels = One Free Ticket Book.
A $4.95 Value.
Right in the Grocery Stores (Lucky's, Ralph's) We used Exacto Knives to remove labels from the Fruit Punch Bottles clearing out routinely as many labels as possible, somehow not just never getting caught but to my recollection never even getting questioned.
We were able to steal entire cases of Coke & Pepsi right out the back of the Pepsi Challenge Tent, there in Knott's Berry farm. Just lift the back of the tent and take them. Cuz they had a tarp acting as a Wall to both conceal their rear storage area and to display signage on so..they totally could not detect us back their pilfering soda, only 2 Workers manning the Tent focused on conducting Pepsi Challenges.
You had to eat a cracker between tasting the 2nd soda. To clear the palette. I chose Coke 100% of the time.
Also, during times when there was No School we'd ride our bikes to the football field at the High School where we were able to pry open the metal front of the snack trailer and reach in and fill gallon milk jugs with Coca-Cola.
Thats not an Actual Picture of that snack trailer. Just to illustrate what it sorta looked like.....with the metal front closure we were able to bend to the side to access the soda fountain.