Photosync is the best. It’s a very clear quality tint and for low level tints, it blocks a lot more heat. 65 on the windshield and 35 all around are really not blacked out at all. Some would have wanted a darker shade if Photosync had it. 20 or so will black it out. Photosync is very clear, so even with 35 someone can still see you decently in daytime. Choose the same level for front and back. it looks nicer to have both front and rear windows at the same level. But as someone mentioned, it’s not a huge total energy difference at the darker shades. It’s the light shades of photosync that is above and beyond other tints. So if you want light tint but good protection, go with Photosync. The windshield is key, whatever you choose. If you live in a cooler climate, you should apply Crystalline 20 everywhere else and just put Photosync 65 on the windshield.
If you want a completely stock look, get 75 all around, but even if you got 65 on the rears, probably only you’d notice the difference. 55 is only really noticeable on closer inspection. You may get 45 on the rears, since 55 is somewhat lighter than you’d imagine.
In any case, regardless of the visible light blocking level you get, Spectra Photosync offers practically the same IR rejection across the board.
It is worth the extra expense just to get that last bit of efficiency out of the car and also to better protect the interior over time if you don’t usually bother putting a cardboard Sun blocker on the windshield.
One thing to note: The windshield tint does cause certain surfaces to show rainbow patterns. It shouldn’t bother you, as the rainbow doesn’t wash things out or blur important details, and in fact most surfaces are unaffected, but it’s interesting to see how some surfaces show a rainbow extensively (e.g. practically all windows in cars). If you feel this will bother you and you don’t wish to wear non-polarized glasses, then you might want to reconsider tinting the windshield. Get a quote from Window Tinting Shreveport LA.