Coke Zero is pretty much the only soda I drink. Once in a while I'll drink a normal coke or a pepsi if I'm desperate, but I always regret it.

The sugariness is awful to me.
I recognize that Coke Zero actually has a really weird taste, but I've somehow trained myself to not notice it. It tastes like normal coke to me unless I pay really close attention. It's dumb, but I don't really question it.

I only drink one once in a while, and it has no calories, so what's the harm, really?
Oh, yeah, and orange soda. I'm not overly fond of orange soda on its own, but when you mix it with some whipped cream vodka,
oh damn. 
I also use Sprite Zero as a mixer sometimes. I drink it by itself once in a blue moon.