I can’t vouch for the author at all, but this seems like a nice detailed, technical look at the difference between the two.
TL;DR the 212CD is very good at what in biology would be called “sit and wait predation”. It’s designed to sneak into an ocean floor crevice and hang out there, possibly for for weeks until something comes by, and then attack it. The Hanwha offering, on the other hand, is less superlatively stealthy and maneuverable, but is much more flexible, allowing missile launches and likely having a much longer range.
It used to be nobody needs nukes, but…since our most powerful ally is the only nuclear power stupid enough to actually use them we get the deterrent value anyway. As client states we were all (UK, Australia, Canada etc) actively discouraged from developing independent capabilities that would reduce our dependency on the alliance or US arms industry.
If people found the US nuclear umbrella re-assuring then, many don’t now. I am Australian, but submarines and the US alliance are a huge issue here as well.
Canada’s geography is very important strategically to the USA like practically no other place. Canada has less need of nukes than just about anyone. Currently the fate of other US allies feels far less secure. It seems we are all just bits of land to be traded to our enemies by the US administration in return for who knows what? It is a very sad state of affairs.
A nuclear weapon is only as good as the resolve to use it