So … I conducted my own Lemon-Lime Taste Test.
I rated the three major lemon-lime sodas — 7 Up, Sprite, and Sierra Mist (nee Slice) — in four categories, worth (arbitrarily) five points each:

Taste Carbonation Packaging Style Nutrition

The Results: 7 Up Taste: 3 points. The reformulated version is, in a word, mild. There’s not much that separates it from, say, seltzer water. It’s refreshing, I suppose, but it’s also kind of bland. Carbonation: 3 points. There are way too many bubbles. I think it’d almost hurt if you drank it too fast. Packaging Style: 4 points. I miss the can with dots, but the logo is dominant and proud and the swirls are kind of trippy.
Nutrition: 3 points. The least nutritious of the bunch (not that you’re looking for a “healthy” drink when you choose a lemon-lime soda …). It has 140 calories per serving and 38 grams of sugars. The can also touts “natural flavors,” but I’m not sure what that means. Total: 13 points Sprite Taste: 2.5 points. Sprite tastes more artificial to me than the others. But, ironically, it says it has “natural flavors,” too. Carbonation: 4 points. Less than 7 Up — it goes down much smoother. Packaging Style: 3 points. The bottle is minimalist, although the “Sprite” logo has perhaps been modernized since my lemon-lime-soda-laced youth. Nutrition: 4 points. 100 calories per serving and 26 grams of sugars. Total: 13.5 points. Sierra Mist Taste: 4.5 points. The best way I can think to describe it is, “It tastes like what I remember 7 Up used to taste like.” In other words, it tastes like a classic lemon-lime drink and I can actually sense lemon and/or lime. Carbonation: 5 points. Much smoother bubbles. In other words, not overly bubbly. This would never hurt your throat no matter how fast you drink it.
Packaging Style: 5 points. I like the splashing limes and lemons. It’s almost anticipatory. (Although the old can with the mountains was too Mountain-Dew-like and made me feel like I should be eating a Taco Bell burrito and playing video games.) Nutrition: 5 points. The “best” — 100 calories per serving and 25 grams of sugars. Total: 19.5 points.
So … there you have it:

Gold: Sierra Mist Silver: Sprite Bronze: 7 UP

I’m surprised by the results myself … What’s your favorite lemon-lime drink?

Is  Reformulated  7 Up the Best Citrus Soda  Our Taste Test Winner Revealed - 64Is  Reformulated  7 Up the Best Citrus Soda  Our Taste Test Winner Revealed - 44