White Chocolate and Milk Chocolate contain a ton of sugar.

Dark Chocolate is made up primarly of cocoa. It's much healthier.

https://health.ucdavis.edu/blog/good-food/dark-chocolate-health-benefits-the-good-and-the-bad-to-this-sweet-treat/2023/02

As a general rule, the darker the better.

Don't be fooled. REAL dark is made at least by 80% of cocoa. If it contains less than 80%, then it's not actually dark chocolate.

If you are used to eating a lot of sugar in your diet, you might be horrified and shocked by the taste of dark chocolate. Don't go to extremes like 99% immediatly. You need to get used to the bitter taste.