Biden and Pence didn't do anything even similar to Trump. The documents found in their storage areas were collections of non-classified materials, and gathered by aids, not the former vice presidents. It was an error by the aids, not deliberate acts that classified materials were included. Both had to collect and pack documents at the end of their terms, and mistakes in reviewing the materials was the issue. As you note the documents were handed over to the archives once discovered.
In Trump's case he deliberately knew of classified materials and himself packed these into his "boxes" for his own use later. He even ordered others to pack these documents, and then move and manage them once the archives and law enforcement learned they were still in his custody.
Questions remain of what he used them for, both while still president and afterwards. There is a lack of record keeping of Trump's activies and meetings as president, and once he was out there's even less accounting of who he was meeting with. All we have is speculation about whether Trump is a simpleton who wanted what he believed was his, or if he retained these documents as a means to personally profit in some way. With Trump's lack of integrity and ethics we can assume the worst.
He is not fit for office. He never was.
