Adoption: Rails is bigger. Both are healthy, and neither is going anywhere. Community: These are roughly equivalent. The Rails community is probably significan

Adoption: Rails is bigger. Both are healthy, and neither is going anywhere. Community: These are roughly equivalent. The Rails community is probably significantly larger, but there's more than enough activity and information coming from both to keep you plenty satisfied. Jobs: It's easier to find a Rails job. Scalability: You can scale both. Both frameworks are pretty heavyweight, but they're also both designed with scaling in mind (e.g. decent caching is built in). Fun: If you like CakePHP, then assuming you don't just irrationally hate Python or Ruby you should feel right at home with either one. Full disclosure: I do Rails for a living.