Where the MK6 is concerned..
DSG is less economical. fact
DSG is not quicker 0-60. fact
And a DSG cannot changed down gears quicker than me. fact (and I will prove it)
DSG is advertised as half a mile less per gallon, so yes, nobody is really disagreeing. It's not much though - much less than the variation you'll get with different driving styles or road conditions.
DSG is advertised as the same o-60 time as the manual, nobody is really arguing.
And fine, you're good at gear changing. You get to save £1,305. For those of us who are lesser mortals though, it's an option worth considering.
Rolfe.