We make gin and tonics fairly often in this house. We always use a diet tonic as it seems to be more crisp and refreshing without the needed sweetness. I must admit, Canada Dry is our backup in case our primary tonic (Schweppes) is out of stock. These are the only two tonics we'll drink. Once you get into the generics they just make for a poor cocktail. Canada Dry is my go-to for ginger ale, but it gets a 4 out of 5 from me as far as tonic goes. It's good, but not the best.