This is a very personal issue.
Personally I find the David clark's large cumbersome blocks of metal which are not easy to adjust (basic model). I personally use Telex Echelon headsets - cheap and fantastic value for money - had 2 headsets for 5 years now without problem...great very very confortable headsets...if you have lots of money there are some nice headsets on the market from bose (400-700ukp!!!!). You biggest choice is ANR or not ANR...but this is usually an issue of cost...