Comfort and Convenience
Seating preference is personal: height, leg length and how upright someone likes to sit all change what feels right, which is why two people rarely settle on the same position in the same car.
Safety and Driver Assistance
The few minutes before setting off are the easy time to locate wipers, lights and the demisting controls, because rain or a fogged screen arrives without warning and preparation costs nothing while stationary.
Multimedia and Connectivity
A phone battery drains quickly when navigation runs for hours, so a charging arrangement is worth confirming before leaving. How calls and music are handled is a separate question, answered by whatever equipment is present.