Lets not get carried away with saying who's best, for front 2 windows and windshield, they are bound by 70% VLT to make the tint legal, hence there's only "that much" heat that can be rejected, Rear windows however, can have more heat rejection cos the VLT requirements are lower. Any of the brands mentioned here are not bad, just have to see which suits your pocket better. Just be careful of 3M CR70 cos if you stick it to your glass and take a VLT meter to measure, its slightly below 70%.(reason being most cars have a slight factory tint on their windows)
If you wanna go to the dark-side and exceed legal limit, if not so obvious you will end up replacing every 2 years cos VICOM inspection they will use light meter to check. If very obvious, TP will stop you on the road, and ask you go do VICOM assessment.