Just to pile on to the answers. Cron is for scheduling work, delayed jobs are for out of band work. For instance: * Use cron to dump a database backup nightl

Just to pile on to the answers. Cron is for scheduling work, delayed jobs are for out of band work. For instance: * Use cron to dump a database backup nightly * Use some job system to send a user an email after they sign up There's a lot of overlap, and if used cleverly (which may not be smart), they can both achieve the same goals.