For me, I really don't taste the difference between Perrier, Sal Pellegrino or even club soda. My fiancee loves Sal Pellegrino, but dislikes Perrier. I don't know why. What do you prefer? For me, there's nothing more refreshing than coming home from a long game of tennis, pouring an ice cold glass of Perrier and reading a book, doing some writing or watching YouTube videos. Ah!
I always go for the store brand sparkling water, personally. It's a fraction of the price of premium brands like Perrier, and I don't see any difference in the flavour. I've more or less given up on sodas - I make my own soft drinks with fresh orange, lemon or lime juice, or low sugar fruit cordials. As well as being much cheaper than Pepsi or Coke, they're also healthier and more refreshing.