How do you figure he knows no foreign laws, foreign leaders, finances, or military history?
I'll grant you that Trump is an incredible businessman and has probably forgotten more about business and finances than Cruz knows, but a one-dimensional candidate doesn't cut it.
You can continue to take your snide little jabs at Cruz all you want, but:
Cruz knows the Constitution inside and out and knows government inside and out and is a strict constructionist. I really doubt Trump could quote the preamble or enumerate the first ten amendments.
Cruz is a conservative at heart. For years, we've been lamenting the fact that we never get a conservative candidate to vote for. I missed voting for Reagan. This is the first time in my life I actually have the opportunity to vote for a conservative, and the country is too pissed off and blinded by propaganda to take advantage of the opportunity. Trump, on the other hand isn't conservative in his heart, and he doesn't understand conservatism in his head. His handlers wrote the positions he claims on his website, and repeatedly have to bail him out when he puts his foot in his mouth and says something wildly un-conservative.
Cruz is more even tempered and doesn't fly into a tizzy when attacked as easily as Trump (and many, many of his supporters) do. You all may find it endearing that Trump hits back twice as hard (or 3 or 4 or 5 times) when he perceives that he's being attacked, but we don't need a knee-jerk, loose-cannon, thin-skinned president dealing with world leaders.
Trump loves America, and promotes capitalism, so yeah, he'd be a much better president than Clinton or Sanders.
But, Cruz loves America too, and promotes capitalism too, plus he's conservative at heart and doesn't have to fake it to gain votes.
That's why.
Now, I've fully answered your questions, and all I've gotten from you is a bunch of snarky, hateful, comments about Cruz and an "I don't know".