Ephiane, as DFC reported they are different companies. Jiaou bodies are cheaper not so much in price as in not having an entirely-steel skeleton (there are steel joints but not the entire skeleton). This makes their movement a little less smooth, and the range of movement and holding a pose is slightly inferior to the all-steel
Phicen/TBLeague ones. The rubbery skin works similarly, but is a little less supple, and is reported to be a different material. The price of Jiaou products is surprisingly usually as high or higher as those by TBLeague.
When looking for specifically TBLeague (
Phicen) bodies, throw in the product number (e.g., M30, M31, M32, M33, M34, and the upcoming M35 for males, and S23B or whatever for females).
Here is a comparison of the different Jiaou male and female bodies I had posted on OSW some time ago. Besides these, there is a KT body color for the female bodies, which is almost identical to but a little bit lighter than the wheat.
CAVEAT: After taking this photo, they went back into their respective boxes, and a few months later I discovered that the "brown" body had broken out into patches of more intensive coloring...
Hope this helps.