Spindrift is the best tasting overall and I like all of them. It's not traditional seltzer and is more fruit flavored than others. Whole Foods 365 ginger flavor is my personal favorite and I buy 2-3 cases every time (which isn't regularly). For overall quality, I also like Waterloo. My family likes the grape, strawberry, and lemon lime. I don't love the black cherry, and DH doesn't love the blackberry lemonade.
Amazon Prime, Amazon Fresh, and our Walmart all stock Waterloo and it's cheaper or comparable to La Croix and Polar. Plus it's PFAS free, which is a priority for us since I have endocrine issues.
https://www.delish.com/food-news/g44663876/sparkling-water-brands-pfas-chemicals/