Light roasts taste different, not necessarily better, and dark roasts aren’t necessarily excessively bitter. And the difference in caffeine due to roasting level is minimal, it is much more affected by type of bean and how it’s handled before roasting.

It all comes down to what you want from your coffee…if you want floral and fruity with higher acidity, go for the lighter roasts. If you want chocolate, caramel and nuts with lower acidity, go for the darker roasts. I personally dislike the floral profile of many lighter roasts, it gets a bit “soapy” IMO, which is the same issue I have with most tea.