I own both of these cans. But I'm terrible at describing what I hear.
W5000 is my favorite headphone on my stystem. I must be a blockhead (HCers, have fun with that gimme) as they fit me perfectly. Apparently this is a problem for most. Perfect for the genres you're listening to. This is the can I use most often.
AD2000 is the most comfortable headphone I have worn. More univerally loved and they will fit you. You will also enjoy them for the music you listen to. However, on some classic rock music they are simply not right. Last night I was using the AD2000 listening to a live version of Kansas. The recording sucked and the AD2000 was horrible. I switched to the W5000 and at least the music was listenable (is that even a word?). However, they are a better choice for the New Age music I've heard.
So the AD2000 is a safer purchase, but IMHO the W5000 is the better can if it fits and you have the right system for it.