@becomethewaifu They prefer Marine One for local trips from the WH not so much because it's faster, but because the motorcades are incredibly disruptive, not to mention requiring extensive planning and coordination. There are about 15 WH vehicles, plus the police and press escorts, and the local police sent ahead to block intersections.
For a helicopter move, it's simpler. Usually an MPD and/or NPS helicopter is sent ahead on the route, then three HMX1 helicopters for the actual convoy.