Kobo is also an e-reader company like Amazon and so their ePub support is fantastic. Boox's is OK but since it's Android you can literally use any ebook app you

Kobo is also an e-reader company like Amazon and so their ePub support is fantastic. Boox's is OK but since it's Android you can literally use any ebook app you want including Kobo and Kindle so it's not a huge deal. The PDF reader on Boox devices is very good too with features like autocroping of margins.