Tint % help need urgent

Window tinting percent help?

Hi guys,



I just wanted to get everyone's opinion and help on deciding what percentage I should tint my car.

I have a 2014 435i M sport line with coral red interior. The exterior is Apine white

Need help deciding between 20%, 30% or 35% all around and 20% the back winshield only Taking all the advice I can get. Thanks in advance