Despite the confusing naming, the WinBook XP5 and XP5 Pro are not even slightly alike. The XP5 Pro is actually more of a lower-end sister system to the high-end FX (both being made by Quanta). I do believe the FX is the older of the two as well. Early FX print ads show it next to the original XP5, with the XP5 Pro showing up slightly later.
The XP5 Pro shares a very similar design to the FX, and I believe the two share some parts as well. The modular bay is the same between the two, but both the battery bay and the modular bay are located at the front on the XP5 Pro, while the modular bay opening is on the right side on the FX. This and other shared design elements (such as the batteries) actually make me suspect that the XP5 Pro's ODM design may have actually been the basis for Apple's PowerBook 1400, which was a heavily modified Quanta design. At the very least, it's the closest match I've seen, and the timeline matches up.
Back on topic, here's a list of the main differences as compared to the FX:
Really, looking at the differences, if you have the pick between a high-end XP5 Pro with a TFT screen and an FX with comparable specs, there really isn't much reason to go with one over the other. I do believe the FX has a slightly better hinge mount design though.
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