This is a pretty hot topic in the anime community. My take is that it depends on the source material (manga) and its respective adaptation. I will say that in my opinion that most of the time manga is superior when it comes to storytelling since anime has a time requirement it must adhere to, but with anime action sequences can be properly visualized compared to a manga. Each medium has its strengths and weaknesses.
I will say this don’t get hung up on these types of debates. If you can find a way to enjoy manga and its animated adaptation.
We anime fans are fairly spoiled in today’s market.