Double wall vs. single wall

[BigRed Beast]

As a new owner (okay, I'm just keeping it warm for my son when he starts driving in two years) I'm fascinated by the double wall vs. single wall top. I notice that most prefer the single wall--weight?--and that the single wall can have interior lights, etc.

Any idea why the option was even offered? Does the double wall offer some additional sound deadening? Strength?

I have a double wall in decent shape--a few fiberglass repairs, a bit saggy in the middle, etc., and I'll clean it up for the oncoming winter, but I'd love to have optional lighting and may try to jury rig something in there.

Interested in some of the population's thoughts...