It's a very different relationship to the Cox-Ince relationship, that's for sure. Ince and Brian can put each other without animosity.
Cox-Dara makes for great TV though.
I cant make out how those two get on together off stage, there were a few catty remarks bounced between them over the 3 programs (and follow-ups). Dara takes on an evil, bitter, even hateful look when Brian speaks, if you recorded the shows just watch Daras facial expressions.
I know Brian (slightly), he has no tolerance for silly ideas, I know he tones his remarks down on TV, except when someone mentions astrology (a particular pet hate) and his reaction then is hilarious.
Dara is very intelligent but perhaps he is intimidated by Brians brilliance.