Personally I would vote for a single
ARgo class ship. Much better in all ways than the followup
Andromedas's. Plus they had the advantage of a better story line.
Traveller does acknowledge the 2nd line battleship-style classes, which the
Revenge / Royal Sovereign class later came to being useful for. I think they also suffered from being built at just the wrong time, with admittedly a few choices that in hindsight weren't the best. Making them able to be fueled by coal or oil seemed like a good idea at the time, but it came at a price. Just like their heavier secondary 6" armament made sense if they were to engage destroyers (which were experiencing a size growth), but didn't make them well suited to AA (which at the time of their design was not an issue). And the idea of making them somewhat rolly-polly to aid in gunnery... well, that didn't turn out too well.
However, while they weren't able to fulfill well their role as first-line battleships, they were well suited to doing everything else a battleship might need to do - escort, shore bombardment, etc. In this role all their limitations were basically eliminated. They could out-range any cruiser or pocket battleship and their armor allowed them to take a heavier punishment than any BC or pocket battleship could ever hope to take. Their lower speeds just meant they would not be able to pursue a faster enemy if they chose to break off. But that wasn't their primary mission so that is not really a deficit in my mind.
The
Bismark class was a well designed battleship. Like all the later battleships it was able to take into account all of the experiences of previous classes and incorporate it into the penultimate design. The
Vanguard also benefited from hindsight, though the Americans and Japanese built bigger-gunned battleships than the Europeans. BC's, conceptually, aren't a bad idea. Though we never really got to see smaller groups of ships fight. The Germans did prove the efficacy of the idea behind their BC's / pocket battleships. What they suffered from was a lack of overseas bases from which to conduct their raids from. That and the sheer numbers that the Royal Navy could throw against them. It would be interesting to have seen more of a naval war where ship classes were spread thinner and BC's would have been defacto battleships against heavy and light cruisers. The
Alaska class built by the US were really remarkable ships, though terribly expensive and never utilized for what their potential might have been. But by there there was really no surface Japanese naval force to go up against.