It seems to be impossible to choose the right pair of headphones considering only a company they are made by. Therefore, I offer you to take a closer look at the features of Audio-Technica ATH-M50x vs MEZE 99 Neo. They are closed-back and wired. In addition, both of the mentioned devices have an over-ear wearing style.
First, it makes sense to compare their levels of sensitivity which are not very different. It is 99 dB in the case with Audio-Technica ATH-M50x and 103 dB in the case with MEZE 99 Neo. The distinction between their rates of impedance is a little more noticeable. The appliance produced by Audio-Technica has 38 Ohm, while the one created by MEZE has 26 Ohm. With respect to frequency response, the model ATH-M50x works in a range of 15 Hz - 28 kHz, whilst the 99 Neo produces the sound in a range between 15 Hz and 25 kHz.
Even though the headphones Audio-Technica ATH-M50x are intended for monitor and studio use, they don't have a completely neutral sound with a slight emphasis on the lows and highs.
Bass is a real star on the MEZE 99 Neo, being absolutely not overwhelming but packing, in any case, a very good punch. Highs are detailed and practically non-fatiguing.
Audio-Technica ATH-M50x is a better choice for traveling and commuting since this pair of headphones is foldable. However, both of the considered devices come with a carry case. Their headband can be adjusted. Another important thing worth mentioning is the weight. The headphones by MEZE have 250 g, while the ones produced by Audio-Technica weigh 285 g.
MEZE 99 Neo vs Audio-Technica ATH-M50x has in-line control. Moreover, only this appliance is equipped with a microphone. The replaceable cable you get with these headphones is 150 cm long in the case with the first device and 300 cm long in the case with the second one.