What most people end up doing
Film on the front. Coating over everything.
Once you accept that they solve different problems, the sensible answer stops being a choice and becomes an order of operations. Film goes on the panels that take impacts, which is the front bumper, the leading edge of the hood, the fenders, the mirrors and the headlights. Coating goes over the rest of the car, and often over the film as well.
That way the stones hit something that can absorb them, and everything else gets a surface that sheds water and dirt. Both jobs done, neither product asked to do something it cannot.
If the budget only stretches to one, the question we will ask is where your car actually lives. Sixty interstate miles a day is a film problem. A garage-kept car that mostly gets rained on is a coating problem. We would rather ask than sell you the bigger number.