I'm planning on buying a new commercial 21" mower soon and am trying to find the best mulching model. Price isn't really an issu since they're all around 1k. What mower have you known to be the best mulching from your experience. I'm looking at John Deere JX75, Toro Proline, Snapper Commercial Rear Discharge/Mulching, Honda Commercial, and Exmark Metro 21". Also, what is the best engine choice, Honda or Kawasaki. Thanks for your help.