Wear one that is comfortable. They all appear to do the job well enough. DCs are great and everyone seems to use them but if they don't fit your head wearing one for 2+hours can get painfull.
I've used Peltors for 10 years and never had a problem, I find them more comfortable than DCs but maybe thats just me. They also fold up nice and small in your bag and they're cheaper.
I totally agree with circuit basher on the impedance issue with DCs. Strange it only seems to happen with DCs.