And that's a great choice for him. But they're different places with different user groups and styles.
I don't see a reason to imply that a person needs to choose one or the other. I use many. They all fill different needs and have different communities.
I think it's a bad thing to limit the ways in which people form communities, especially now. I think creating an environment in which people are told that one place to build community is better than another is unhelpful.
@JoanGrey Yeah agreed, people can go wherever they want, and I wanna put my efforts into the fediverse.