From my experience, the choice really depends on what you want to prioritize — privacy, sunlight, or heat retention. I looked at the guide on https://www.tintfit.com/shop/energy-saving-insulation
and here got a good idea of which tints work best for which rooms. For example, darker films are great for big living room windows facing west, while lighter shades work better in bedrooms where you still want natural light. It makes the house feel more balanced and comfortable, and you still get most of the energy-saving benefits.