welcome to the Hook Productivity Forum, @monica.rysavy
If no one beats me to it, I will write up a summary for Notion like I did for Hook and Roam research. But Roam does not yet have an app whereas Notion does. Roam’s app lacks a linking API. (But as noted on Twitter, we have been in touch with Notion, who are apparently adding some AppleScript / JavaScript. I’ve also sent a message to the Notion CEO.)
So I would focus mainly on the Hook + Notion as web tool.