Hi @Juan Manuel Santos ,
Welcome to the community!
For Trello, you can find pricing details here: https://trello.com/pricing
For Confluence (the Wiki solution), you can find pricing details here: https://www.atlassian.com/software/confluence/pricing
As you can see, your choice heavily depends on how much features you want to use and how big your organization is. If you're a small start-up with limited requirements, you could maybe even get away with a Free subscription. But, if you need more, and more sturdy support around the clock, you'll need to look at either Standard or Premium to make the most out of the products.
If there is any question, I'll be happy to help you further!
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