Looks like they are offering the 212
CD. If that's the case, I vote for KSSIII. If it was the 212 CD
E, I might be more inclined to "like" that offer. That was a substantially improved version of the CD, though I don't know how developed it was. It was offered to the Netherlands for their sub program, so presumably more than just a concept. Of note though, it lost to the Naval Group Barracuda variant "Orka", which is also a good candidate for Canada. Given all we are asking these boats to do (expeditionary, trans-oceanic, under ice), I think that all points to a bigger boat. Crew comfort also supports a larger vessel. To my eye the 212 CD seems too small. But, I'm not a submariner, so I'm open to criticism on that point.

Personally. given the effort that the Korean have put into this so far, and all the promises they have made, I still find the KSSIII to be the most promising option.