Apollo is very user friendly and very easy to start using straight away. Relay classic has more boilerplate and steeper learning curve. Relay modern is what I would recommend instead of relay if you want to go down that path. Its got performance improvements and improved usage so it's easier to adopt. Apollo is easier for first timers and has good support with graphcool. Ive used both, i would go with apollo.

@yus So, you'd prefer Apollo instead of Relay Modern?

For first time users, I recommend apollo. Relay modern is still very new. It came out 2 weeks ago. It doesn't support server side rendering. Its not as widely used yet compared to apollo. If you are adventurous and like to play with the latest and greatest, then perhaps u sld use relay modern. But if u have a deadline to deliver, use apollo

Thanks. I don't have a deadline as it is my own project, but I'd like to have SSR.

me too! ssr support for classic relay was done by someone else, not facebook. There were 2 open source projects to get ssr going for classic relay, i think its isomorphic-relay and isomorphic-relay-router. I was at react europe and spoke to lee byron, facebook has no plans to add ssr support to relay modern.