Actually, I ended up putting a 35% on the front sides, I didn't want to look too gangster and get pulled over all the time... I did a lot of research and was going to go ceramic (the best heat resistance), but the shop explained the ceramic has a different color hue than the factory rear glass... I think my 35% is a very high grade vinyl film (cheaper than ceramic too)... If your new ride has no factory tinted glass then you can go ceramic all the way...
There was a lot of back and forth for me on the cost benefit of ceramic... for seven windows of the good stuff your probably looking in the $1,000.00 range... Some of the Tesla guys tint everything including their huge sunroof in the $2,300.00 range...
At some point you have to figure what the vehicle is and what is good enough... My decision was pretty much made for me so it is good enough, not the best but good enough...