The 900 mk2 is pretty nice but it can get up there in treble, but personally I don’t find mine fatiguing, I would just be a bit concerned if someone was sensitive. Also little isolation but little leak so that’s probably fine
Denon Ah 7200 is a Good phone i use it myself and hearing Metal too when i would it.
Or the greateat Model from Denon Ah 9200.
Look here
The Guy hearing Metal too and can say more about it.
I don‘t try the Ah 9200 but i find the Ah 7200 really great.
All Music genre work well.