I own both. I had no major problems with the current Kobo update.
Are buttons for page turning important to you?
The Kobo has only one mechanical button -- the Home Screen button. All other navigation uses the touch screen. The Kobo touch screen uses either taps or swipes to turn pages. Sometimes the taps don't register.
The Sony has page forward and page back buttons and buttons that bring up a menu screen. The Sony touch uses swipes only for page turning.
I don't know what these differences might mean to someone with tendinitis.
The Kobo has more control over font size, line spacing, and margins than the Sony. How important would this be to you?
My husband reads mostly paper books. When he wanted to read a book that we owned in digital copy only I loaded it onto both the Sony and the Kobo and offered him his choice of reader. He thought the text looked better on the Sony and chose to read it. This was before the most recent update to the Kobo which allows for fine tuning of fonts. The difference he saw then might no longer exist.
I'm happy with either reader.
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