Gas equipment, gas regulator, which company's products are better?

If it is a voltage regulator for ultra-high pressure long-distance pipeline, RMG in Germany is better, but the price is higher; If the pressure is not so great, Emerson's Fisher and Tartarini are more cost-effective; If it is only low pressure, Chengdu Jiu 'an, Shanghai Aofei and Changzhou Xinli in China can do it.