[svandamme]

depends on the type of submarine work.
full ocean worldwide patrols, endurance, yes, versatility, yes

But there are some very very good diesel electrics out there for near own coast operations that are very good as well, if not better because they can really shut down EVERYTHING and become way more silent then a nuke boat.
Ability to quiet everything down is pretty important for subs.

Swedish Blekinge class by Saab just to name one, and the German Type 212 are not to be underestimated

I don't know how well these boats can detect, or how well they can train their sonarmen. The US probably has more advanced training simply because of scale of the program and a bigger pool to pick people from.
But the best sonar man in the world can't hear chit if the boat truly has everything turned off.. Which a nuke cannot do and a diesel electric can