Another thought would be about which is going to be easier to replace for you country. Subs are great fodder and replacing them is easier on the pocketbook than FIG’s or CV’s, and especially if you are Japan. US can afford to usually replace that kind of loss, but most other countries can’t.
For 72 IPC’s, I’d go with a mix like ones mentioned earlier, with DD’s, CV’s (+FIG) & SS’s. If split over a couple rounds, maybe SS/DD first in case of early strike