I had the Dunlop, 20000km gone back from 6mm to 3mm (21" 239).
Now i have the Bridgestone on 20" 227's.

The bridgestone are much better in rain (especially braking)
The bridgestone make some more noice (only 3000km driven) but the Dunlop's became also noisier after 14000km so Dunlops made more noise after 14000km than the Bridgestone now.

For the 21" there is only Dunlop Rof avaiable, 20" Rof Bridgestone and Dunlop.

So my choise for now is 20" Bridgestone and in a month i change them in non Rof Conti Wintercontact -front 275/40/20 rear 295/40/20- (and sell the Bridgestone at ebay)