I would never get 50%, thats WAY too light. Whats the point of getting tint if its not dark as f*ck? I live in CA where all tint is illegal on the front windows. But I still rock the 15% on my civic and 20% on my nissan, and I definetely like the 15% better. 5% is pretty awesome too, but sometimes at night you cant see anything, kinda risky
Heres the civ with 15%
And heres the nissan with 20%