Sleeper. I switched my home league to it this year.
The why - extremely powerful data mining ability in a very pretty, and intuitive, package. Virtually seamless across device/desktop as far as user interface. The message/chat function really does a great job of actually encouraging owner interaction and chatter. Fun recap reports every week. It's just well done. And funner.
You can have a seemless live draft with both in person and online participants. Users can enter their picks on their own device or commish can enter picks, or change at a whim . The draft can be paused, reverted, at a whim. You can cast the draft board onto your display of choice.