cli tools are better than gui tools (generally) as they are way more extensible and they don't change much over time. cli tools can be cobbled together to accomplish some complex task. open source tools are better than propriatery tools.
since they don't change over time, you are less likely to face any hinderance in your workflows. cli tools often provide qutie powerful mechanisms (like vim macros) and complex tasks become quite simple when you utilize these mechanisms.