At least if I select a thread, I get on to it. On the old site, on a mobile, the list of threads would move just as I put my finger down. Also, it's quicker to respond to reply posts. No dreaded three second wait wondering if the post would post; hopefully this board stats responsive when everyone arrives.
It's far superior on mobile hardware with much more user friendly features. If you put this one side by side with the old board on a desktop, I'd pick the old one, purely for its simplistic layout. Of the 2, this board wins though, it's the board we all wanted for the most part, so to poo poo it would be churlish