This is primarily an audio based Sport...heck a guy can easily do it blind, and some guys figured out a way to do it deaf even...but the targets accuracy is transcribed into an 'audio signal primary' and a 'visual signal secondary' if you have the TID feature on your rig..
We all have various levels of hearing degradation, as well as head size.
Being a cheap old guy, I hunted for years using junker phones, did ok, but I am really enjoying the crispness and comfort of a quality set of cans...I got a big old head, larger than normal, had to wear a 5 gal bucket for a batting helmet when I was in Little League 40 yrs ago even, like a Pez dispenser or Mr Potato Head if you will....bad ears too...So I recently sprung for a set of GG NDT's...independent dual volume control...I really enjoy them, and it makes detecting less frustrating and and overall better experience....I hunt by tones though...rarely ever look at the TID except for strange tones I've never heard before..
I hunt heads up, using my eyes for approaching danger or finds, and ears for dirt targets...so yeah, for me Phones are a Big Deal!
Mud.