Looks almost identical except that Notion doesn't support bot actions. Once Notion builds an API and has support for things like IFTTT then we'll see it become even more powerful than it is today.
But I was surprised to find relatively basic features (like find/replace in page or a shortcut to find in table) missing so hopefully Notion's team will get around to implementing those soon.
The one big difference being that I believe Notion will outlive Tables - especially as Tables is already touted as an incubated project.