Check out the attachment to compare performance data between the different types of tint from a reputable manufacturer. What you're really looking for is the %TSER value. You'll notice that the ceramic tint outperforms dyed.
I have Huper Optik 30% on the pano sunroof. I had hoped to put 15% but the shop does not stock that percentage and I didn't want to wait for them to order it. Huper is one of the better performing films, but I find that the Texas sun this time of year is still too hot for my bald head. So I keep the pano shade closed most of the time.
I've got a couple of young kids and they like the shade being opened. If we're riding somewhere during hours when the sun isn't directly overhead, I'll open it for them.
Additionally, I'm struggling with AC performance and keeping the shade closed helps the cabin be more bearable when its 109* out. I think once the weather turns cooler, I'll keep the shade open more.
I'm contemplating re-tinting the moonroof myself with some Huper 15% so the heat rejection will be better / let less light in as well.
I have 5% on the driver/passenger fronts, 15% on the rear passenger seats, and 5% on the back glass. All Llumar ceramic. My kids are 6 and 4 and are forward facing. I had 5% on their windows on my last vehicle and while I enjoyed the darkness in the back, its almost too dark for curious children who like to look outside as we're driving. The 15% over the factory ~20% or so matches the 5% up front very well from a exterior color standpoint and lets them be able to see more of what's passing by.
If you want him to see more out the back, just throw some 15% on there and he'll get a lot of benefit from the UV/infared rejection.