It kind of varies on a case by case basis, some people will insist on full deletion… which we consider a last resort because it leaves gaps in existing conversations when their posts are deleted. This can do a lot of damage to a community if the user was very active.
With anonymization the user information is scrubbed and the account is given an anonymous username, so you can still see the posts and their association with the anonymous user. Definitely better than deletion for the community.
Suspending forever works fine too, and leaves the door open if that person wants to return someday. You can still delete or anonymize the account if you change your mind.
There are a couple of settings you can configure on your site:
