I think the Iowa's were the best battleships ever made or planned, followed by the Lion class.
The South Dakotas are often recognized as the pinnacle of battleship development. They were more efficient to operate than the Iowas (from everything I've read). The Iowas were kept in service because they were more comfortable... and probably because Harry Truman was from Missouri.
I can of course see why countries wanted to build there huge ships, but they would have been slower than the Iowa's and Lion class which would have meant them controlling the engagement. The only one of the huge ships that would have stood a chance was the Montana class because of it's firepower.
You unsurprisingly make no mention of shipboard electronics (and the American and British with their enormous advantages) or fire control mechanisms. These, rather than "speed" or "more armor", will win a fight. Only the USN battleships had the ability to blindfire their main battery guns. Radar-controlled gunfire is an enormous advantage (more so than "firepower" - whatever that means).
In the case of my dream carrier nuclear power is needed to have a all nuclear power fleet which can go none stop at full speed without having to worry about the escorts, replenishment ships and minesweepers because they are nuclear powered and can keep up.
Nuclear powered minesweepers, escorts, and frigates don't exist for a reason... my uneducated guess is that it's cheaper to make conventionally powered ships than to make "small nuclear reactors" for a bunch of small combatants.
Anyway, you seem to have a video game-level knowledge of warship design and tactics... which is fine, but please, do yourself a favor and listen to some of the experts here first.
Do you really believe that I come on here asking questions and starting a debate because I think I am right? I am here to learn from people who have expericence I don't have.
I still think speed, armor and armament were just as important as electronics. Firepower is having more guns than the enemy so you have more firing power at the start of the engagement. Have you never played Empire Total war?
No I have never considered nuclear powered minesweeper, rather what I thought is that they could be carried by the replenishment ships and off loaded when needed. As for ASW frigates I wasn't sure about them, other than maybe them being unmanned so they would only need fuel.