Trump benefited from the picking of mild-mannered, old guard Pence; it helped to bring social conservatives and more traditional Republicans out to vote for him and provided a good contrast to Trump's erratic behavior. In Clinton's case though, I think she would have definitely benefited from a more enthusiastic VP pick like Elizabeth Warren or someone of that grain. Hillary already had a problem of coming off as inauthentic, robotic, and cold. Picking someone with similar traits as her VP was a terrible decision.
