I'm not Ourdesign, but I can give you my comments.
For clear film, they usually come in packages that preselect the parts that are most usually covered. The typical full package would be something like bumper, hood, any front facing lights, side mirrors, A pillars (the metal pillars on the sides of your windshield), door edges and door cups. Basically anything that faces forward plus the door edges/handles. Then there are packages that drop certain pieces to make it cheaper (as you've experienced with your quotes).
For my past three cars, I have had full packages done. If you have a lot of rocks being kicked up in your area and want film protection, it's best to cover all your front lights and hood at a minimum. Those would be the two most expensive things to fix/repair. As cars get newer, the cost of headlight housings are outrageously high. It used to be you could buy the whole headlight housing (which included the bulb sealed inside) for under $100, now if you get a rock chip/hole in your light(s) it's several hundreds or > $1 thousand to replace the housing.