A biplane cannot take out the Bismarck, my friends. The same should apply to a battleship v. fighter in FL.
There should be ABSOLUTELY NO chance that a fighter can take out a battleship alone. The battleship could be slightly, so very slightly, damaged or inconvenienced, but impossible to destroy or make run away.
On that same rationale, it should be difficult for the battleship to take out the fighter, but, seeing as how it would be a battle of attrition, the battleship will eventually win.
That's my vote.
Wait a sec, I need to rephrase it in Tortured Soul's way... hmm..
"No, you tosser, it should be... whatever I wrote above!" Does that work?