Between her and Trump, I think one potentially positive but unintended outcome of another Trump term could be the weakening of the US' hegemony and chipping away at its status as a geopolitical and military leader, which could at least reduce the likelihood of other countries' readily aiding the US in its military and interventionist abuses.
On the other hand, Trump himself is an impulsive hawk, so he could be even worse in terms of foreign policy, especially if he started a war with Iran or China. Both candidates are repulsive, and the fact that the standard is now so low that Nikki Haley might seem appealing compared to Trump, or vice versa, is a sad reflection on American politics.