It isnt like you cant compare, but some things are obviously better in one media than the other. Like for example battles are usually better in anime because it is hard to convey motion in manga. In the same way some scenes work better because manga doesnt have motion or sounds.
I wouldnt say
obviously especially when you then go on to say "sometimes/usually" when for the sake of comparison there are times where it isn't better in anime, that alone justifies the purpose of even comparing them in the first place.
As theres been numerous LN, Novels, and manga where the anime did the fight so badly it became laughable, or scenes lacked impact cause bad voice direction, my stylistic choice, or even again lazy action. And even outside of fight scenes, some conversations, romance threads, dramatic delivery of death/sick scenes, plot twists and so on can be better in the source, example, bad/distracting music choice during a dramatic scene.
For heroaca, Im sure people have somethings they preferred the manga doing than the anime, and vice-versa, hence why I dont agree with people viewing each in a vacuum and taking an all or nothing approach to discouraging people expressing opinions on what they felt are pros/cons to the anime/manga.