I don’t particularly like Cruz, and had some of the younger and more interesting candidates made it all the way, I’d be more than happy to support them. However, Cruz is a strict constructionist of the Constitution and actually thinks about what he says and can back up his statements. He’s not a loose cannon who says whatever rolls up on the Magic 8-Ball of his mind at that particular moment and he thinks will be popular with his followers.
Except he steals ideas - like the wall and limited immigration - from the loose cannon who you say says whatever rolls up on the Magic 8 Ball of his mind, whatever the hell that means.
One thing he has never deviated from: stopping muslim immigration, stopping the migration from south America and being tough of crime. Most Trump supporters agree that if he can do half of the things he promises, he’ll be a successful president.