I wonder if anybody can help me on this...

Which type of Minn Kota Transom-Mount should I choose for the
following boat:

440 pounds, 14.5 feets

I am thinking of a Vector or a Maxxum model.

Do I need a 24V or a 12V motor?

I will buy probably anyway two batteries. I have read that the 24V
needs less Ampere. Will the 24V model run as long as the 12V model,
longer or less longer? How long will it run approximately anyway?

Thanks for any advice!
Markus