Realistically speaking I would go for the car. Horses now a days are not the ideal source of transport specially if you are moving from State to State or in-fact from City to City.
Generally now a days Horses are kept as a passion to riding or because of the love towards them, however on the other hand Car is a necessity to life, at-least now a days it is a must.
As per your situation I would definitely would go with the car.
Hope this helps