I think for a 'ship' with munitions not aircaft, armour, for a given size, weapon performance/spec it can only be the Yamato class; even if they were wasted, ill unused and were less useful than the Germans railed heavy/super cannons, even so in my mind, they are at least joint 1st, or within the top 3. It is just as well as for us, the HMIJN utilised them mostly for ego and not for war, or in anythink like a more proper warlike navally offencive manner where those macro cannons could find and home in on a target.
There was a few chances where they could've fired in anger, but they largely ignored, kept safe (to preserve egos) or used ineptly tactically by (higher) brass whom didn't wish to be the ones whom 'lost it/them' following the Navies sand in the headedness after Admiral Yamamoto's assasination. For that the allies should be greatful as we never saw what they could do had they been utilised as they were designed to, thank the/your/whichever deitie(s).
Airpower is largely 'king' nowadays, but for how long; war, warriors and their weapons do come and go around in cycles at times...