I have my third set of Metzler - so far very happy. Tried Pirelli and Dunlop once: didn't like Pirelli in wet conditions, and Dunlop had a slightly worse handling on twisty roads IMO.
Others may have other opinions. I think it depends on a) your riding style b) your road conditions and c) weather conditions which tyres you prefer.
Dunlops may give you more mileage, but for me stability is more important, as I replace them early anyway - don't want to take any risks.
You'll have to try it yourself.
BTW: I make 4500 - 5000 miles with one set of Metzler, about 6000 with Dunlop.
Current: 2014 BMW K1600 GTL Exclusive
2012 Silver BMW C650 GT
History: HD Ultra Classic CVO, HD Heritage Softail, Honda 1100 ACE, Honda Spacy 125, Suzuki XT 125, Puch Maxi
Our most frequent mistake is to believe that others think the same as we do.
Last edited by HDBeemer; 05-03-2015 at 02:34 PM.