Unsure what differs between the two functionally, but it appears that library is ~3x the size for js+css (~12kb vs ~30kb) compared to Grid.js. It looks like it might use jQuery too? Or at least, the CDN is "jquery.dataTables.min.js"

datatables uses jquery, though.

Yep, it's got more functionality at this point. I wonder if the author of Grid.js could incorporate the added functionality.

From user point of view, datatables can do much more than Grid.js

I've found datatables to be my only real solution when dealing with lots of server side data. It has it's quirks for sure, but there really isn't anything I haven't been able to accomplish with it so far (although making it do what you want sometimes can involve some head scratching).

Edit: I see http://www.tabulator.info/ mentioned in the comments. This looks pretty full featured... time to do some research.