HUGE difference, my car is on 3M Crystalline 60/70. Been using 3M since my first car, 12 years ago. You won't regret it. But price now is around RM2k for whole car. Good thing is you save on petrol as your car cools much faster.
Don't bother putting non-branded car tint, and besides UV rejection, the infrared rejection is important too

If you're caught in traffic on a hot sunny day, with a good tint, you don't have to full blast the AC continuously. On a super hot day, I just put level 2 fan speed. That's quite some savings there i believe