The biggest difference will be the pencil each supports. The 10th accepts the second gen pencil that attaches and charges magnetically.
The 9th is the first gen pencil and has to plug into the USBc port and it is clunky; not going to be charging while stowed away in a bag for instance.
Also, the 10 will take the Magic Keyboard and folio, which is very functional as a keyboard, stand, and case.
The 10 is more capable than my 2yr old pro and less than what I paid.
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