i maintain that drumpf's perfect vp candidate would be joni ernst, a female veteran from a swing state who is considered an outsider but does not totally lack experience/legitimacy.
cruz, on the other hand, would be likely imo to pick a running mate from within the establishment, given what his path to the nomination would look like. probably nobody really moderate, but a mainstream republican like chris christie, or john thune. rubio is also a possibility. if he does venture outside of those bounds, it'd be mia love or a different token woman/minority.
clinton or sanders would likely pick someone incredibly boring (kaine, warner, …)
Boring may be good.