As far as the silicone options go, Id assume they are all essentially the same formula.
So find the coating locally in the color you can live with, and go with it.
Gaco has the long track record however. And was the only game in town when I went with a silicone roof. Originally contracted by NASA as I recall.
It is legit stuff, and will NEVER degrade. But is quite soft when cured, so it can be damaged by hard/sharp stuff dragging on the surface.
It can also be re-coated anytime, which is wacky for silicone. So verify that whichever coating you find can do the same.
I coated our camper with tan Gaco when it was first built.
When we did a color change to the current white/grey scheme, I changed over to white.
With regards to insulation, it does provide considerable sound deadening.
We can barely hear light to medium rain hit the roof in our camper.
It also remains crazy cool in direct sunlight, reflecting a large part of radiant heat.
Remember that comment about re-coating any time?
Since it sticks to itself, you can layer it and use it for all kinds of neat things.
Coated roof, roof wire glands installed using the gaco as a gasket, then overcoated for a permanent seal.
And the stuff is crazy self leveling.... so brush it on, roll it on, it doesnt matter. It levels out the same.
