Seconding what Ari said. What're your priorities? Trello is quite popular for agile project management and supports everything you mentioned, but not sure to what degree you need these things. I'm not up to speed on Slack but I know lots of people use it. Currently using Igloo as an intranet and it can, kinda, support workflow management, but has a lot of information-sharing and document sharing tools.
do you want something for a small team or for an institution? Trello and Slack would be great for just picking up and going (assuming you don't need waterfall PM features), while Jira or Igloo or BaseCamp are better for institution-wide project management.
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