I was looking at that choice for my latest project and the gem recommended (resque?) only using Redis for the job queuing at the benefit of much higher performance over something like delayed_jobs using postgresql in jobs. It didn't seem worth it as job queueing was not the main feature of the server. I suppose if one were doing some sort of real time feature where you had to queue things off a Rails API response thread it would make sense but wasn't doing that for now. But just judging by the number of downloads, the Redis based job queue is possibly more popular for some reason.