The best way is to use them and see. But Trello is ONLY Kanban, Jira uses Kanban as part of their system, but not only Kanban.
There are no Sprints in Trello if you need those.
Trello is very full featured, but not NEARLY as full featured as Jira. But Jira would be too much for some people too. Therefore they would probably be happier with Trello.
Trello is not bad at all though. I still use Trello for personal notes and daily tasks. While the organizational team structure is planned through Jira.
