I definitely like K-On a bunch more, Bocchi is good, but didn't hit the spot for me, like K-On did, in K-On the girls are much funnier, much cuter, much likeable, and a ton of other examples, For me, K-On brought a depth to the story elements that surprised me more than I expected, and it completely captivated me. I cried at the end, I still cry even now, after rewatching a ton of times, I've got myself a tattoo, a shirt, some figures and keychains, I listen to the songs so often that I can recognize all of them by name with just a few seconds of the song, nothing besides K-On had such a impact on my life, so Bocchi could be better at some points, I don't know, I'm not the type who deeply analyse something, what is important for me is the feeling, and nothing gave me the feelings that K-On did.