There is no guarantee that a [chinese semi-known brand name here] box contains the same board or other components if you buy it two times. This is both because of "clones" trying to coat-tail a somewhat successful box, factories producing the same basic box model for different customers and the brands trying to source the cheapest components available.
There was a sale of a certain S905X box at amazon.de a few weeks ago. Single seller, all stock from the same amazon warehouse. People received boxes with different packaging, branding and wifi chipsets. Some are very happy, as everthing works fine with libreelec, other cannot get wifi to work. Android version is different also, with OTA for some versions, but none for others.
So I can only recommend to go with a top-brand, known-to-be-good and well-supported device: Get the wetek hub or the odroid c2 with a case.