Where do you fall in the great Diet Coke vs. Coke Zero debate? Let's break down the key differences with a beverage expert ...

Pepsi Zero was originally called Diet Pepsi Max, then Pepsi Max, before it was renamed Pepsi Zero Sugar in 2015. Pepsi tweaked the flavor when it reformulated Pepsi Zero Sugar to reduce caffeine.

However, Pepsi is offering the new flavor, in both original and zero-sugar varieties, as 20-ounce bottles for a limited time. Keep an eye out for the new flavor in late January.

Pepsi has seen quite a few soda varieties come and go from its lineup, and one late '80s offering from the brand was actually ...

Pepsi Wild Cherry: A cherry-flavored variant available since 1988. It remains popular in the U.S. and Canada. It’s also available in diet and zero sugar versions.

Diet Pepsi: Debuting in 1963 as “Diet Pepsi Cola,” this low-calorie, artificially sweetened soda was rebranded in 1964 as Diet Pepsi and is still a leading soft drink around the world.

It’s popular globally, especially in Europe and Australia, though it’s known as Pepsi Zero Sugar in the United States. Pepsi Wild Cherry: A cherry-flavored variant available since 1988.