PCG has free color samples of their vinyl. Order one and tape it onto the car to see if you like it.

https://www.performancecargraphics.com/Stripes_Lettering/Vinyl_Color_Samples.htm

The reflective vinyl is usually thinker mil, and has more of a lower gloss/matte hue to it outside in the sun. I have this type of vinyl on some bicycle wheels. You can see the reflectiveness working at certain angles in the daylight, but it's not as pronounced as one might think. At night is when it really stands out.