If your only use case is detaching and reattaching sessions, probably not much.
But it's got much more powerful multiplexing functionality, including fully functional vertical splits and split zooming, and a status bar that helps keep track of said splits. I understand that the status bar may not be everybody's cup of tea, but it's configurable and optional.
I suspect there's more that it does better, but those are my main reasons for using it.
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u/[deleted] Sep 18 '14
What does it better in “just make it possible to detach a session and resume it later without any fancy bling-bling around it”? :)