It's hard to say. Cruz is arguably just as dangerous as Trump. The difference is that the whole world except his supporters know that Trump is a buffoon. Cruz is dangerous and, like Nixon, cunning.
Eh, I see pluses and minuses to both.
Good thing about Trump: He really has no idea what he's doing which limits what he can get done, he's less ideological than Cruz, he's more likely to be caught doing something warranting impeachment (whether the House goes along is anybody's guess).
Good things about Cruz: he's not an overt racist pandering to authoritarian types, he alienated a lot of his congressional allies, I trust him to peacefully hand over the reigns of government after 4 years.