It depends on your grass.. If it's cut nice and short, no problems. I had wheelpants on virtually all my models, flying off grass here in Las Cruces and it never was a problem. Also, you can position the wheelpant for more clearance pretty easily. It almost always makes good sense nowadays to build with a removable gear, which means it's pretty easy to keep all your options open, including taller gear to accommodate longer props, etc.
As for cleaning out the wheelpants, I don't see that being much of a problem, but our experiences in the southwest are with little or no dew. Again, however, if you make your wheelpants where they can be serviced (e.g. changing a wheel out) your options are completely open.
Personal preference here.
L.
"If life was fair, Elvis would be alive and all the impersonators would be dead." -Johnny Carson