Driver......or. Rider?
If talking motor vehicles - driver. If talking equines - rider.

Red.........or Green?
red

Pirates......or. Philanthropist
philanthropist

Gravy........or. Butter?
butter

Dog..........or Cat?
Oh jeeze! I have to pick???? Uh cat

Iron..........or wisps?
Wisps

Cowboys....or Astronaut?
cowboy

Numbers........or. Letters?
letters 'cuz I love to read

Betty boop.....or. The Librarian
Librarian I guess

Fresh water.....or Salt water?
fresh