Studio headphones prioritize accuracy over fun. You need to hear what your mix actually sounds like, not a flattering version of it.
The critical distinction: open-back headphones are for mixing and mastering. Closed-back headphones are for recording (tracking). Open-back lets air pass through the earcups, creating a wider, more natural soundstage but leaking sound in both directions. Closed-back isolates, preventing your headphone audio from bleeding into microphones during recording.
Impedance determines whether you need an amplifier. The Beyerdynamic DT 900 Pro X at 48 ohms works great plugged directly into an audio interface or laptop. The Sennheiser HD 600 at 300 ohms needs a dedicated headphone amp to reach its potential.
The Audio-Technica ATH-M50x has become the industry standard closed-back because it's accurate enough for professional work, folds flat for transport, and has a detachable cable. The Sony MDR-7506 has been the broadcast and podcast studio workhorse since the 1980s because it's accurate, lightweight, and under $100.