I tend to think of the Gozanti as more like an escort carrier than a real carrier. Or, maybe I want to say like an Aegis destroyer with a helio pad. Basically: those 4 Ties are a nice bonus, but not the main reason it's there.
The Raider, though, seems built for the kinds of missions where you want to scare the hell out of your opponent, but don't want to commit much to it. Or, for a hit and fade on lightly defended rear areas. Whatever the Star Wars equivalent of a bauxite mining operation, an attack on that. Important, not front line, and probably defended with fighters instead of capships. And you can just blow it up, rather than garrisoning it.