Polls show on Rubio at the moment, but it is early. She beats Trump handedly.
No, Hillary only beats Cruz easily. He does the worst in head-to-head polls. Trump has beaten Hillary in a number of polls, same with Rubio, both have also lost. It’s cruz who consistently loses the hardest against Hillary.
Jeb/Rubio’s only advantage was against Biden, Trump did horribly against Biden, but with Biden now out of the race, the hatred of Hillary is helping Trump.