abgd,
From many years of trial and error I now use (and thoroughly recommend) CEP allied with whatever decent helmet/headset takes your fancy. Personally I use an Alpha Eagle, but that may not suit everyone and certain applications.
ANR often cannot cope with an open cockpit/doors off environment and actually makes things worse. Many times I had to turn my ANR off when firefighting and having my helmet out in the open as the feedback became quite unbearable. CEP has no such problem, and is a passive noise attenuation not reliant on any power supply or circuit boards.
It can also be transferred from helmet to headset, creating the same excellent protection regardless of platform.
I wish I'd had something similar all those years ago when the real damage to my hearing started.