From one perspective, this all boils down to an argument about which candidate can actually reach the Presidency in the general election. And while I understand that there is a good argument that Trump cannot win, I have believed Cruz to be a losing proposition since well before Trump was even mentioned.
Regardless of calls for gravitas or policy acumen, the general election is mostly a beauty contest. Sadly, many think it be a choice of the perfect candidate, where it is always the lesser of two evils.
You are of course fully entitled to your opinion but the numbers, the approval numbers indicate exactly the opposite.