Trump is a more long term threat due to the long term fallout and international perception of the United States as a result of his actions.
Yes, his Immigration related EO does not affect nearly as many people as the rhetoric would indicate -- but what it does do is prevent travel to the United States for some 22,000 persons (and counting) at the very least while, by consensus, not really being likely to prevent entry to actual terrorists. It is not that the bill is truly discriminatory, just that it is likely to be ineffective in its aims while damaging international credibility of America as a land of inclusion (or, to rely on imagery from the plaque of the Statue of Liberty, a golden door, to accept your tempest-tossed refuse).
Second, while his threat of 20% tariffs on importation from Mexico may seem like it originally promotes "buying local", there are several long term ramifications. First, construction materials and machinery [1] for American factories will ultimately increase the price of American produced goods as a result of this measure. Second, this bill will, directly and immediately, grant China greater bargaining power--with the United States. Thirdly, it causes Mexico to negotiate more aggressively with its local neighbors and with overseas partners, potentially closing trade avenues altogether with America.
Ultimately, it boils down to one thing: Trump's measures appear to be reactionary, with little view for long term fallout, international reputation, and future trade relations with partners that are not directly related to his current target (eg: trade relations with Mexico deteriorating, giving China greater negotiating power).
[1] http://www.cbsnews.com/news/what-does-the-u-s-import-from-me...