As Riding Rails is written by the Ruby on Rails team, it's one of the best resources for up-to-date information on news, bugs, documentation and more.
The design of the blog is bland, with no clear separation between the blog posts. The frequency of large linked text can make it difficult to read.
The author of A Fresh cup, Mike Gunderloy, is an experienced Ruby On Rails develop and author of two Ruby on Rails books (Rails Rescue Handbook and Rails Freelancing Handbook).
A Fresh Cup is updated often, usually daily, with new Ruby on Rails-related technologies and updates.
The blog posts are generally short and only provide links to outside sources with very little description.
Ruby Inside blog posts contain condensed and important news that all Ruby developers can benefit from.
Ruby Inside is generally only updated a few times a year. For more frequent updates, you have to rely on their weekly newsletter.