Does the linked page not answer this? That's what I'm confused about I guess. In a nutshell, the biggest philosophical difference between the two is that Notio

Does the linked page not answer this? That's what I'm confused about I guess. In a nutshell, the biggest philosophical difference between the two is that Notion is "free form" while Basecamp has a sort of built-in workflow. (Take this with a grain of salt, I haven't used Basecamp since shortly after they rolled out the new interface and it was much more limited then than it is now. And I've only briefly used Notion.) Notion is sort of a wiki, with built in to-dos and spreadsheets. You can build your own workflow or adapt an existing template to how you work.