:withstupid:
LOL! Seriously though, all you have to do is head over to your local tint shop, have them cut a small square off their roll (or dig in their scrap box!) and have them install it on your front door in the parking lot! You can then see what tint will look the closest to the stock film.
The three brands I've worked with over the past 20+ years (good god I'm gettin' old!) are Llumar, 3M and Suntek. These are all good brands that have warranties and are the least prone to turning purple or blistering.
Currently I have Suntek's CF series at 18% on the fronts, and its dark! Darker than the stock tint on the rears, and its a bit on the reddish hue, which knocks all of the green hue from the stock glass out. I like it, but think I would probably go one step lighter if tint laws are an issue where you live. For me, it seems people in Idaho would be able to get away with black enamel spray paint over all their windows, judging by how many blacked out cars I see, but in Oregon (where I used to live), if you have anything that looks like it might be close to illegal (even by 1%), they'll pull your ass over!
Also, if the shop you use only has one brand, have them leave their sample on, drive over to another shop or two, and see what comes up being the closest to stock, tint is easy to be removed and it shouldn't cost you a penny to do this. I know I did this many times for customers when I was installing 3M back in Des Moines (don't ask!)!!!