Personally, I would go with the Acer, on the virtue of having a proper warranty, and local support.
If you need to meet a lower price point, I would go for the Teclast X2 (because you mentioned you like the full-size USB port).
My only concern with the X2 or the Cube is the possibility you may be shipped a tablet without a legit copy of windows. Microsoft doesnt offer free Windows licenses to devices over 10″, so alot of chinese companies deliver Windows 8 or 10 with a registration hack.