Problem with some anr is they are useless if the battery goes.
I like my DC anr because they turn into normal good passive headsets if anything goes wrong. Plus our aircraft headsets are the passive DC and our techs are more than happy to keep mine serviced with ear pads and mic socks etc. DC seem to cause the least problems with the various intercoms etc. They just work. And if there is a problem nobody will instantly blame the pilots headset.