Well, different people like different headphones - depending on their subjective listening experience and preferences.
So let´s find out what makes a good pair of headphones based on objective and subjective factors.
Objectively, the main characteristics of good headphones for composing and mixing are :
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Open Back
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Frequency Response is as flat/neutral possible
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Impulse Response is as short as possible
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Harmonic Distortion is as low as possible
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least-fatiguing as possible
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comfortable to wear for hours
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reasonably priced
But Subjectively, neutral sounding headphones may not always be what you want/need :
Since most headphones out there tend to be pronounced at the high-end and low-end of the frequency spectrum, and people got used to it so much -
for many it will take some time to get used to listening to a more neutral sound.
One might even be disapointed when trying a neutral sounding headphone for the first time.
But from my experience it is worth it and pays off in the long term.
Also, depending on the noise level in your working environment Closed Back headphones or In-Ear Monitors (IEMs) might work better for you.
At home i work in an open room with my wife and child around me.
I primarily use monitor speakers and the Sennheiser HD650 coupled with an headphone amp and eq.
For when it is getting noisy i use the Sennheiser IE 400 PRO in-ear monitors.
At my workplace i can only use closed back headphones which is not optimal.
In the last 20 years i used/tested quite a few pairs in the price range 120€ - 600€ with mixed results.
Like others i also started with beyerdynamic but later on started to prefer the more neutral sounding models/brands, and it is difficult for me now to still work with the DT 990 PRO for more than one hour.
Some models i used / still use and some experiences with them :
beyerdynamic DT 770 PRO 250 Ohm - ok for recording but not for composing, lack of clarity (especially in the low-end), muddy, fatiguing
beyerdynamic DT 990 PRO 250 Ohm - ok for composing, partially ok for mixing, too much high-end, fatiguing
Shure SRH1840 - ok for composing and mixing, pretty neutral and good response time, great overall sound and comfortable, unfortunately too much harmonic distortion in the low-end
Sennheiser HD 650 - ok for composing and mixing, one of the most neutral sounding headphones with good response time, great overall sound and comfortable, acceptable harmonic distortion
Sennheiser IE 400 PRO - ok for composing and mixing, very good response time, great overall sound, a bit too much low-end and high-end but much better clarity than many open back headphones
Eventually one should use monitors for mixing anyways but if you know your equipment and use reference material (like one of your own songs for example) for mixing, you can get pretty decent mixes with headphones.
Cheers !