I like Diet Dr. Pepper when I’m sick of rootbeer or cream soda.
As far as the known detrimental effects of diet soda, there really aren’t any outside of its potential impact on dietary patterns. That is pretty individualized, however.
Dudes, Yes! Diet Barqs is the best! It has bite, only root beer with some caffeine kick.
But, add one to the diet soda crew. Just one with 2nd lunch for me though. Diet Dew is my usual, mostly because it’s free at work and I’m too cheap to buy my own root beer.