TRANSPORTS ARE THE MOST IMPORTANT NAVAL UNIT
Never forget that.
Without a transport, a fleet is useless. It can’t take territories, and can be ignored.
Subs are good to have, BUT, don’t have to many, or you risk the possibility of being attacked by JUST planes, by the Japanese. In which case, your subs aren’t even part of the battle.
Wheter it’s land, sea, or air, it’s always good to have a mix of everything. Personally with the navies, as I have said, I lean towards more aircraft, simply because after you win against the said navy, you can use it against ground troops, or for ground defense as well.
If your navy is the exact SAME as your opponents, or even roughly similar, you are likely to not be attacked, your opponent will have to have MORE than you (most of the time), or his attack will fail. And if the entire japanese fleet is in one location, that’s a VERY good thing for the Allies.
I don’t buy battleships often, but when I do, it’s to match my opponent, and add that little bit of extra OOOMF and fear that’s needed. Said aswell, if you get enough battleships, 2 or 3, you can do “strafing” attacks. Where you attack for a round, and retreat, reinforcing your retreat, which then heals on the next turn, whilst your opponent may have lost ships, or also taken damage he can’t readily repair.
That said….
Transports! Transports! Transports!
Make sure you have more transports than the Japanese! And if you don’t know where to put the units, it’s HAWAII, and Australia. If you hold those two areas for the GAME. The Japanese cannot win.