Kendall, I'll bet you are talking about a Nick Apollonio 12? I have never heard a 12 string with the throb and purr that those Apollonio
12 strings have. The one I played 30,000,000 years ago had a cedar top on it big enough to shingle a barn and it was tuned to open "D".

Otherwise, any good guitar has the ability to sound great in an open tuning. My 0-16 sounds exceptional in "G". But the instrument seems to have an affinty to the vibration of a G note. A friend blew a scale with his clarinet into the sound hole on the little Martin and when he hit a G the guitar just rebounded back a G tone.
(Non believers try this yourselves before you serve me a ration of shit please)

I think any well balanced tonally guitar will sound good in DADGAD.

Don