It may be $100 to $200 cheaper than the Surface Go, but the Microsoft tablet will likely last you a lot longer.
https://www.notebookcheck.net/Chuwi-UBook-tablet-sacrifices-quality-for-price.448962.0.html
The Ubook may be priced like the Surface Go, it weighs more than the Pro. Someone who really wants a Go, probaby won't consider the Ubook.