People who keep making remarks about nuclear wars with Trump in really want to stop using Twitter and the outpourings on leftie luvvies as their sources. Hillary Clinton is more of a sabre rattler. Russia and China favour Trump because he will be more of an isolationist and not intervene as much as Clinton would have done. NATO members who haven't paid the contributions in they are supposed to may well have to start spending more on defence if Trump decides that they can pay up or America will not offer a nuclear shield any more, as he has said he will.
People before the war criticised the USA for being isolationist, then after it they have criticised them for interfering too much. If Trump does tell Europe to paddle their own canoe it will be interesting to see what happens if Putin decides to test out the resolve of its neighbouring countries if he thinks the USA won't intervene.
Either way, Clinton or Trump, it would have been a more dangerous world.