Persona/personality/Trump’s characteristics: Tweeting, immature, inconsistent, prone to deception and exaggeration, little grasp of complex situations or of how things actually work, etc.
Policies: The wall, tax cuts, Supreme Court nominees, judges for the circuits, withdrawal from Syria, meeting with North Korean leaders, etc.
AIUI, Trump’s policies actually aren’t much different than what any other Republican president would be doing in his stead. And compared to George W. Bush, his wars in Syria and Afghanistan have cost only a tiny pittance in comparison to the thousands of lives lost and trillions of dollars spent in Iraq. No major terrorist attacks or major economic collapse have happened (yet) under his watch. Building a border wall is something a President Cruz (or Rubio, Jeb, Pence, Ryan, Romney etc.) might very well be advocating for, albeit in much less bellicose fashion. President Obama deported a great many undocumented immigrants as well during his 8 years (in fact, isn’t Obama technically the record holder for most deportations?) The Tax Cuts and Jobs Act isn’t at all different than what other Republicans would have done, if they were president.
So it seems that the vast majority of opposition against Trump is more against his persona than his policies? (sure, most Trump opponents oppose both, but this thread is asking about which they object to more)