Hard agree on subjective nature of the quality. Even for loudspeakers it is really up to your own preferences, and when it comes to IEMs/headphones - there are no 2 experts that will agree on what is "the best".
ANC does degrade the quality, but in the noisier environments like planes and trains it is probably a good option for less-hassle listening.
Momentum 2 were famously terrible (had these and enjoyed a lot - until i tried something else). Hope 4th model is better.
The only real advice to OP here would be to find an offline store and go listen to some of the models they have. Bring your own music! That is how I realised that neutrality of HD600 is my benchmark. However these are open-backs, wired and twice the price (
You can also try to understand what kind of sound delivery you prefer: bassy, neutral, bright - that would narrow down the options for you.
Crinacle tested a lot (though he stopped updating his database unfortunately) - this may give you some ideas. https://crinacle.com/rankings/headphones/
Good luck!
And to add to your very good reply, most people also do not like the studio monitors sound. Younger listeners are more likely to choose bassy booming gear, while older farts like me would rather have it brighter (more higher frequencies delivered) as our ears tend to degrade with age in that part of spectrum. To make the right choice, nothing can beat going somewhere and listening different gear with your own ears and preferred music, unfortunately.
Oh, almost forgot. OP!!! THIS IS A RABBIT HOLE! RUN FOR YOUR LIFE BEFORE IT SUCKED YOU IN FOREVA!!!