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You can find out exactly the difference by asking GitHub https://github.com/ruby/ruby/compare/v2_6_6...v2_6_8.
Second. I recommend rbenv to manage versions. Two choices. 1 - Install from AUR. 2 - Install from https://github.com/rbenv/rbenv
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.