These are facts, not personal attacks.
Trump lost the election in 2020. His team filed approximately 60 lawsuits to protest the results and every one of them was dismissed for lack of evidence. Every recount/investigation found no evidence of meaningful fraud. He appointed fake electors to override the votes of the people and asked VP, Pence, to count those instead of the real votes/electors. He asked 2 different foreign powers to interfere in 2 different US elections. His lawyers pled guilty to racketeering to change votes in GA. He continues to say the election was fraudulent against him.
On his way out of office, he took hundreds of classified documents. He / his lawyers lied to the National Archives about having them. They had insider information that he did have them. They gave him almost a year to produce them, then had to send the FBI to take them back.
He has called for the execution of the top US Military General for disagreeing with him. He has called for disbanding the Constitution. He asked for absolute immunity for all things pre, during, and after his time as President. He has stated that he will fire federal employees who are not loyal to him. He has stated that people who beat police officers, broke into and vandalized the Capital in an attempt to stop Congress from ratifying the election are heros whom he will pardon.
That is just some of his anti democracy actions.
Harris has no criminal record, nor any credible accusations of criminal activity. She has won all elections she has contested. She was the California Attorney General and was harsh on drug crime and corporate crime. She has stated her support for NATO and other US Allies.
Please feel free to search any of the above statements. Hopefully I have made your choice more clear.