In recent days, Ted Cruz has attacked Marco Rubio on Rubio's well known, and since abandoned, proposal favoring a path to citizenship/illegal immigrant amnesty.
Then, Marco Rubio attacked Ted Cruz on Cruz’ (and Rand Paul’s) resistance to NSA's warrantless accumulation of email and phone records from American citizens, going so far as to link Cruz to Edward Snowden and the atrocity at Bataclan.
That settles the Cruz/Rubio question for me. Rubio is suspect on illegal immigration and squishy on the 4th Amendment. And, trying to tie Snowden and the Paris atrocities to Cruz is despicable.