Irn Bru or dandelion & burdock.

Sugar-free Canada Dry Ginger Ale.

Vernors

If you live in the UK, Lidl sells an excellent cola called Freeway. Their Freeway Zero is better than Pepsi Max or Coke Zero, IMHO, and literally one-fifth the price.

regularly drunk: go-to is rimarily Coke Zero because it's the easiest to find here and no empty calories.

special occasion: probably some variety of birch beer with ginger-ale being a close follow-up. On rare occasions, a very cold regular coke on a hot summer day (though not the US ones; last time I went back, both regular and diet had this really weird taste I don't remember being there before).

A rarity, but Maine Root has(had?) a drink called "Pink Drink", a carbonated Prickly Pear Lemonade. I had it at the Austin City Limits festival. It was, without a doubt the most refreshing drink I've ever consumed. I usually drink mostly water (free) at the festival, but that year we spent somewhere in the neighborhood of $60-80 just on cups of Pink Drink because we couldn't get enough of it.

I really, really, REALLY wish they sold bottles of it, but as far as I can tell, it's only occasionally available and only as a fountain drink.

Bitter Lemon

Moxie

Barq's root beer. It's a pretty rare find in my area. But it's a special treat when I find it.

Vanilla Coke is a close 2nd place.

Ale-8 for flavored sweet drink, sparkling mineral water for unsweetened.

I'm from India, Thums Up is my absolute favourite. Always loved it over coke and pepsi. During the 90's we'd a drink called goldspot, that was an amazing soft drink. It's sad coca cola company instead of continuing goldspot, launched fanta here instead, which honestly is a watered down version of the classic goldspot.

I used to love both Vanilla and Cherry Coke, but I can't stand cola flavors (any brand) ever since I got covid last year. So it's been mostly the cream soda flavor Dr. Pepper if I drink soda at home.

Bawls, which is sadly getting harder and harder to find. And IBC Black Cherry

Manhattan Special Espresso soda.

Made in Brooklyn. Two shots of espresso in carbonated form.

Calpis Soda

Perrier carbonated water

It's subtly bubble and has a very mild flavor

Topo chico for lyfe

Before COVID, Coca-Cola all the way. Not too sweet, and was often more consistent in cans and bottles.

Something happened after COVID, and it no longer tastes the same. I don't know if this was the effects of the illness, or a change in manufacturing.

... Right now, it's Dr. Pepper (or Cheerwine, if I can find it). Sharp bite, good flavor, doesn't really have an analog with other drinks. However, I can buy one bottle and it be perfect, and buy another bottle the next day and it be less carbonated than it needs to be, or too sweet and syrupy... And I can't ever tell why.

I prefer Pepsi over coke . But I really like jarritos pop other than the cola flavor . Also cream soda dr pepper is awesome.

Canada Dry ginger ale I guess, good chaser for the rare whiskies I don't like neat. Honorary mention for Pommac, but I have not had it probably 10+ years

Fanta, regular Fanta.

Colombiana or Ambassador!

It's so good you can mix it with beer (we call it Refajo)!

Georgia makes the best soft drinks in the world in my opinion. My personal favourite is pear flavoured Natakhtari: https://natakhtari.com/lemonade

Also fun fact: Lemonade means soft drink in a lot of places in the world, I hear that's lemon flavoured water in the US.