I guess whales (+10% science) are really nice for a spaceship win, but other than that there aren't too many monopoly effects that play specifically into a specific victory type. Many civs have bonuses that guide them towards a specific path, and I wouldn't say the monopoly bonuses are enough to offset that.Another question! Corporations! Should we decide our victory path(or victory ease) with what kind of monopoly we have?
Generally I "decide" my victory path around my 7th social policy. This is a good time to do so because statecraft or aesthetics are very helpful towards certain victory types. You can certainly change paths later, and its important to look for stuff that shut down certain victories, such as Mongolia eating all the city states