F type Or M type??

Hello,
I am currently in a situation where I want to go from a tourist visa to an F type. It seems like I qualify as the company I was hired on to work for which is American is a distributor for a Chinese company. I will be getting paid from the United States but will need to be in and out of China for the next year or so on business.
Since my company will be funded strictly through the United States which type makes the most sense?
-Alex