Just look at Germany. Imagine how much better things would have been today if they'd shut down their fossil power plants before the nuclear plants.
Sorry, I forgot, you only want me to choose between nuclear and coal.
Well, coal is definately worse than nuclear, so if everything else was equal I'd definately choose nuclear as the better option. But, since they intend to phase both of them out, and since the Greens got some power recently they've accelerated the coal phase out by nearly a decade, and they have a carbon tax and emmission controls which mean they won't actually run the coal plants as much as they otherwise would and it's mostly an insurance policy, I'm not really that fussed.
I'm still annoyed that it took them so long to get on the EV bandwagon though, but they did a lot of good work with solar so I guess it evens out.