Advantages Of An In-Person Hearing
To maximize your chance of winning, always demand an in-person hearing because it reduces the likelihood that witnesses will actually show up and testify against you. Though the Department of Motor Vehicles can issue subpoenas to bring witnesses to the hearing, many people (especially law enforcement and crime lab personnel) simply ignore them. They know that DMV almost never does anything to enforce a subpoena, and they frankly have more important things to do than show up at DMV.
This simple tactic changes the outcome of more DMV hearings than any other single procedure.