Personally, I like JIRA. I think it adds a ton of transparency in our org, and while I've used Trello for personal and home projects, I don't see how it's good enough for business. Trello doesn't even allow for time estimates (last I tried), which for us is part of planning. Search in JIRA is also really good, so no ticket is ever just lost to the ether.

Sure, it's not perfect, and waiting for a board to load is annoying, but for distributed work and visibility, I haven't seen something as professionally useful.

Open to exploring though.