The main advantage of nuclear power on a carrier is space for aviation fuel. The nukes carry twice as much as a conventional carrier of the same size since they don’t have to haul fuel for their boilers.
I believe the Kennedy class carried 1.5 million gallons of jet fuel (and 2.5 million gallons of fuel for the boilers) whereas the Nimitz class holds 3.5 million gallons of jet fuel.
I’d rather have two USS Kennedy (CV-67) class than one CVN. We have plenty of modern fleet oilers than can carry fuel.