I've said it many times: 4chan is a hive of degeneracy and 8chan is where people that have been banned from 4chan go.
Because of that, I don't think it makes sense to treat 8chan as a single community.
It's somewhat true, but still, reddit hosts right-wing communities like /r/the_donald, while 8chan hosts, for example, /leftypol/.
Both sites consist of multiple, separate communities.