I disliked the hectic "cards" look of Trello and it's lack of a chat channel. I learned that Trello and Slack was an often used combo and for a second thought I would be Mark Zuckerberg in a hoodie if I used Slack but then realise that there was no way I wanted to mess around with two API linked softwares. So i found Podio.
It has a bunch of free apps that can be added to "workspaces"
It has a great chat channel
It handles images / attachments very well (screen shots / design moc ups)
The team likes it.
My favourite app is the forum app! It's great for riffing on ideas - then threads can be turned into tasks later.
It also has Bug report apps
Only drawback is, you can't add to it off line, so if I am on the subway / tube : plane - I can't work on it. But nowadays I get wifi between stops on the tube and on a plane - so that's OK.
Check out Podio - that Trello card thing doesn't suit everyone.