Onyx Boox Tab Ultra / Ultra C — Should You Buy the Keyboard Cover?

I have been using a Bluetooth keyboard with various Onyx Boox devices for a long time. I recently bought the Onyx Boox Tab Ultra C along with the Keyboard Case Cover. Which one is better and what are the things you should keep in mind?

Enjoying a cup of coffee and Onyx Boox

For this review, I will be using my trusty personal Bluetooth keyboard for comparison: Microsoft Universal Foldable…