My really quick analysis - we are in a very high noise environment, and we found the RF portion of the Ruckus gear outperformed Meraki. Where Meraki really shines compared to Ruckus + ZD is logs and analysis. In a coworking space with a hundred people or so, it was so easy to troubleshoot with the Meraki gear - the logging was wonderful. With the ZD, we really can only see things in real time and by the time the ticket comes to us, the user is gone and we have no data.
Both of these pros/cons are very specific to us though...