Both are point tested but visa 189 is direct Australian invite - You don't need to find a Territory to invite and nominate you. With this PR visa, you can live anywhere in Australia without territory commitment. The catch, it's more EOI competitive and has fewer eligible occupations.
Subclass visa 190 is a state nomination visa - You will need an Australian territory to invite and nominate you first to apply for a PR visa. The territory will ask you to commit to their territory and you cannot live and work outside it for a specified period of time.