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Hard to pick.
There's a big overlap in western vtubers and browsing this website. Both millennial and zoomer vtubers are cancerous in this regard,
However, millennial vtubers tend to be a lot more subtle with their 4chan humor. They'll usually do their thing and throw a couple obscure references here and there, stuff viewers would have needed to lurk to understand.
With zoomer vtubers, there's no subtelty. Most will happily flaunt the fact they're here, going as far as tagging their streams with shit like brat, uoh, based, ahegao, etc.
tl;dr: Millennial vtubers are a cyst, zoomer vtubers are a metastasized blob.