Always go with the metallized film, not the dyed film. Metallized does not mean "mirrored" (although it can be). It just means that the light reduction is done through metal particles instead of by a dye. That means that the light level will simply be reduced, not colored some other way.
The only other thing I can think of is that states usually have
maximum tint levels that are acceptable. They may vary by car, and even by which window. The fines aren't usually anything to worry about, but it's often something that can prevent you from passing your inspection. It would suck to get the tints and then have to strip them off a year later (or find a less-than-legal inspector). I imagine that your tinter would tell you that, but I'd look first just in case, and if he doesn't tell you, I'd go elsewhere.