Clinton is a politician and does political things.
But Trump is a liar and a thief, with questionable dealings and immature behavior over the years. He's ripped off suppliers, gone bankrupt six times. He doesn't have the temperament to deal with world leaders. When he had his chance, a brief chat with the President of Mexico, he was told at the start that Mexico wouldn't pay for his idiotic wall. Trump said nothing. He had his chance to prove he could negotiate rather than yell and demand in front of 10,000 followers. He choked. He's a fake, a liar, and has no ability to do anything but make things worse.
Even a regular politician who cares at least a little bit about the constituents beyond the billionaires will at least try. Trump wouldn't know how. What ideas he proposes are usually absurd, such as a tax plan that uses old trickle down schemes and will break the Treasury by trillions of dollars. Yeah, that's change you can believe in — to do what "W" did in 2007 to the economy.