state owned is pretty clear in its meaning; it's a company that is funded, owned, and controlled by the state.
privately owned here includes both what would classically be called private companies (owned by a few private individuals), and also public companies (publicly traded on a stock exchange). basically, any company where the ownership is in the hands of some amount of private individuals/entities, who may or may not work for the company.
a worker owned company is a company where total control is in the hands of its workers; through direct democracy, or through electing leadership, or through some other means.
I have a poor view of corporations just because some of the things they do don't make sense. Like paperwork for example or for the fact that many of them don't actually care about their company, they just care about appearance.
If I could choose it would be two options. I'd rather be self employed or in a worker either/or family owned company, you can't beat those.
@GunSmoke9 They're quite a varied thing. In general though, workers will all own an equal share of the company, and they will vote on things that affect within the company. At the end of the year, each worker will take an equal portion of the surplus/profit, the size of which depends on how the workers vote to divide it. they could vote to reinvest parts of it into the company or the local community, for example. Worker owned companies tend to favour labour rights over making lots of money, tend to reinvest in their communities more by percentage than private businesses, are generally smaller than private businesses, and tend to last longer.