Setting vegetation fraction (VEG) and LAI in WRF for CMAQ input

When running WRF for eventually proving meteorological input to CMAQ, what is the recommended practice for preparing the VEG and LAI parameters in WRF (pre 4.0 version). I saw this setting in the namelist.wps file being talked about in another post:

geog_data_res = ‘nlcd2011_9s+9s+greenfrac_fpar_modis+lai_modis_10m’

How would above differ from just setting

geog_data_res = ‘nlcd2011_9s'