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.