You can easily use the same framework both on the server and client, especially a general purpose one. Makes life easier. io.js uses the current version of V8.

You can easily use the same framework both on the server and client, especially a general purpose one. Makes life easier. io.js uses the current version of V8. node uses an outdated one. Makes life easier if your code is being executed in the same engine, with the same version. Everything that works in one, works on the other.