Polaris all way along. And thanks th Hammerhead price increase you can obtain a cheaper Polaris.
Polaris will go up in price, probably 950$ or more.
Polaris can do all the Hammerhead does but it is just slower killing fighters unless you bring more fighter which is easier with a Polaris. And it can bring a fighter and/or small ships full squadron, help to control space, work as a forward operations base, be used in the Vanduul war, do torpedo runs, probably scans/detect ships better, etc.
And of course it will be profitable. Much more than Hammerhead.
And of course you can manage it with you and your NPCs. (Fighters would need their own players/NPCs)