There is little doubt that the two GOP candidates who came out of last night's debate the strongest were Marco Rubio and Ted Cruz.
Obviously, it remains to be seen if this will be reflected in their poll numbers. It might be a bigger challenge for Cruz as much of his natural support is with Trump, but if he starts to cut into Trump's support then watch out. Let's put it this way. If Jeff Lord turns his attention from Trump to Cruz then we know that the ground has shifted.
With this in mind, I think it is safe to say that Cruz excites conservatives more than Rubio. But if Cruz wins the Republican nomination, I don't see him beating Hillary Clinton. If you were to ask Hillary's camp to pick between Rubio and Cruz, I bet they would say Cruz without hesitation.