What are the advantages and disadvantages of using the upstart script or forever script in a context of running node.js scripts ??

Question

I am a node.js developer. I use Amazon ec2 to deploy my node.js apps.

I want to have my node.js service running permanently - restarted if it fails for any reason.

I came across 2 tools . Forever and Upstart

Is there any advantages of using one over the other ?

Is there any other tool which is better ?