That's not a rational argument.
The rational thing to do is to look at all of the qualities of a candidate... their policies, their personality, and pick the one that you think would best benefit you or the voter. Rejecting a possibly superior candidate just because they belong to the wrong party is not rational, its foolish.
That's hopelessly naive and wrong. The party is like a massive body whose gravitational pull holds its candidate in orbit. Yes, any particular candidate can adjust the radius of his orbit by using his thrusters to speed up (to move closer to the center) or slow down (to move closer to the core of the party), but he can never achieve escape velocity. A Republican President will always adhere more to Republican positions that a Democratic President will. Perhaps most importantly, a Republican President will not intentionally nominate liberal justices to the Supreme Court, whereas a Democratic President will.
The bottom line is the party identification should be all-important to a voter who actually sees himself as clearly in one camp or the other.
Another irrational argument. Just being "not hillary" does not make anyone a superior candidate.
Hillary has serious flaws which she has demonstrated throughout her career as a politician and government employee. Those are not going away. On top of that, she is supported by a deeply embedded phalanx of cronies (many of whom are in the media) who will protect her from any and all accusations and investigations of wrongdoing. She is potentially very dangerous as President because she is thoroughly dishonest and has gotten away with virtually every dishonest thing she has done.
Trump of course has his own flaws, but as politician and leader is something of a wildcard. He also would have no natural support within the political establishment or the media, so any misstep would be punished harshly. I can see the power of the executive branch being diminished during his administration, which, frankly, I see as a good thing. It would reverse a decades long trend.
Hurray! An actual policy position that can be examined!
Ok, lets consider that policy... Trump wants to "crack down" on illegal immigigration. Part of that will be a wall, which will be extremely expensive and ineffective.
You see, claiming a candidate is good because they will deal with a particular issue is only relevant if what they'll do is actually beneficial. Spending billions on an ineffective wall is not better than doing nothing. Its worse.
The wall may cost ~$25 billion by some estimates, will be largely ineffective (many illegal immigrants arrive on legal visas and overstay, others arrive by air or boat or other ways, and even the ones who cross by land can simply use a rope), and can negatively affect both the environment (affecting migration habits and isolating sub-populations of various species) and the lives of people who live there (the existing wall has subdivided some communities, since it can't follow the border exactly; its unlikely Trump's wall will be any different).
First of all, $25 billion is peanuts. The average illegal immigrant household
represents a net cost of over $14,000 per year to the country (although mostly to the city and state in which the household is located). At 3.5 million households, that's $49 billion a year in net cost. That dwarfs the cost of the wall, especially after netting the construction cost with the extra border enforcement costs we have in the absence of a wall. Even though a wall would drastically raise the cost of crossing the border illegally, and hence reduce the flow dramatically, the largest boon would be that we could normalize the illegal immigrants already living here without creating a moral hazard (i.e. that of providing extra incentive for more people to immigrate illegally).
As for your claim that a wall would be ineffective, I think that's obviously false. Walls have proven very effective pretty much everywhere. Israel's West Bank wall (which admittedly is a fence in parts) has worked extremely well, and stopping motivated, well-funded terrorists is a lot harder than stopping impoverished peasant families. This idea that you can climb over a wall easily is ridiculous. Climbing over is slow and you expose yourself to surveillance technologies. The idea that you can dig under a wall is even more ridiculous. It would take a tremendous amount of money and time, and, unless the tunnel was dug extremely deep, it could be detected quite easily. It's simple economics really. If you raise the cost of X (where X is crossing the border illegally), then the demand for X will drop. Seeing as how most people who desire X are impoverished anyway, my guess is the demand for X is quite elastic.