Will iPhone X from TMobile A1865 or A1901 work globally? I travel frequently between China and the US. I have T mobile in the US and Unicom in China. 

According to apple's official website, the iPhone X (A1865) is the only model that works with China Unicom. 

I plan to purchase an iPhone X with the option for Tmobile on Apple's website. According to MacRumors, iPhone X with T Mobile is supposed to be A1901. 

However, "the iPhone X A1865 is considered the global phone as it works on both GSM and CDMA networks. This phone is also available as a SIM-free factory-unlocked version at Apple Store."

Which of these statements are true?

Which iPhone X model should I purchase if I am only interested in LTE?
According to https://www.techwalls.com/iphone-x-models-a1865-a1901-a1902-differences/ you better buy A1865 which works globally:

A1865
The iPhone X A1865 is considered the global phone as it works on both GSM and CDMA networks. This phone is also available as a SIM-free factory-unlocked version at Apple Store
A1901
The iPhone X A1901 is the GSM version. It is available on AT&amp;T and T-Mobile in the United States, as well as many other Europe and Asia countries.