I think that the DNA 3sixty is much better than the extreme360 because the DNA 3sixty is a bit more detailed. Especially the interior is much better.
you can't really compare them I think because DNA only makes the spiderversion and Extreme the modena. So you can't compare things like the whole roofline etc. (very important details in my opinion). If they both made the same version of the 360 then you could compare them better!
The DNA 360 could better be compared with the Ferrenzo 360 and the Extreme 360 could better be compared with the SRC 360 or the Dave Jones GTA.
And the interior... You have a point there! The Peugeot-dash just doesn't look like a Ferrari-dash at all...