We tested Pepsi's soda for millennials against the cult-classic drink it emulates - and it revealed why the beverage giant will never be cool

LaCroix's aesthetic is unselfconsciously tacky in a way that isn't "'80s-inspired" so much as something that looks like it has been collecting dust since the '80s. This is what has helped make it iconic, as it doesn't look like anything else on the market.

Meanwhile, bubly's cans — with greetings on tabs and messages such as "I feel like I can be open around u" — feel precisely on-trend. It falls in the uncanny valley between adorable and trying a little bit too hard — you can imagine the endless rounds of focus group testing as creators tried to calibrate the exact level of twee.

The carbonation levels are well-calibrated. The bubbles level is not too overpowering, but they certainly make their presence known, something that proved to be a positive in all the bubly we tasted.

The grapefruit flavor itself isn't very strong. In fact, the burst of grapefruit scent that escaped when we cracked open the tab was stronger than the actual taste.

The flavor doesn't taste bad, but it also doesn't taste like much. If anything, it's reminiscent of an extremely watered-down cup of lime Jell-O that has somehow been transformed into a sparkling water. PepsiCo says that bubly uses all natural flavors, which makes the distinct smell and taste of lime Jell-O especially bizarre.

If we had to be specific, we'd pinpoint this flavor to an apparently unintentional rip-off of mixed fruit Welch's fruit snacks. The flavor isn't overpowering — it's something like if you licked a Welch's fruit snacks package after finishing all the snacks inside.

The smell, however, exploded out of the can once it was open. In general, it seems as though Pepsi is relying on smells to trick drinkers' brains on taste instead of actually packing the flavors into the beverage.

The flavors just have more depth and actually taste like citrus — not lime Jell-O.

Both of these flavors are more flavorful than many of their sister flavors. LaCroix again comes out on top with a more lasting flavor and aftertaste, while bubly seems to rely on the initial burst of taste that comes with the first whiff of the drink.

While not every tester was a fan of every LaCroix option, the flavors tended to be unique and lasting. In comparison, bubly was more fleeting and forgettable.

However, the beverage giant went all-in on cutesy packaging without realizing that LaCroix's semi-tacky branding and idiosyncratic flavors are what have made it a cult classic. With Pepsi's backing, bubly will probably make millions of dollars, but it's never going to be the cool cult favorite that LaCroix is.

bubly represents a great opportunity for PepsiCo — but don't expect it to steal LaCroix's crown any time soon.