I've had Crystalline 40 on past cars and Ceramic IR 25% on my previous model Y's front side windows - aesthetically the CIR looked better but it was a little bit too dark (completely subjective). Heat rejection was pretty equivocal. Wish I could comment on how well the CIR 70% worked on the rear but I never got to sit in the back of that car.
I almost skipped out on tinting the rear for my second model Y but the wife said she wants the most protection for our little one so that's how we ended up with Photosync on the rear. I was on the fence between 70 and 55 and ultimately ended up with 55.