Unions are better than worker owned co-ops because they are directly antagonistic towards the class struggle.

Look, much love to like, teachers' and nurses' unions, but the SEIU local that represented me at Albertsons was not "directly antagonistic." Here's what they did: take union dues and use them to lobby the dems for free childcare. When I asked them to enforce chemical labeling rules the rep was suddenly out of the office. We don't just need unions, we need militant orgs within the unions.