Is air resistance affected by both mass and surface area?

Question

If so, which has the biggest impact?

Answer 1

What a layman calls "air resistance", a physicist would call drag. Drag is affected by the area and shape of the solid object, the speed and orientation of the object relative to the fluid, and various properties of the fluid such as its density and kinematic viscosity. The drag on a solid, rigid object isn't affected by the object's mass.

However, drag is just the portion of the force on the object that's due to the fluid. The net force on the object will of course be affected by the object's mass, assuming that gravity is one of the forces on the object.