I received a pamphlet in the mail today from Westland turf, one of the turf suppliers I use and these were the reasons they gave:
a) Buffalo Grass is much more tolerant of the alkaline soils than is couch grass and is highly suitable for Perth’s coastal suburbs.
b) Buffalo Grass has been shown in trials to require no more water than couch grass to maintain colour
c) No scalp marks and can be mowed with a rotary mower
d) Buffalo Grass produces no underground stems (rhizomes) and because it only spread by surface runners (stolons). It is easy to keep out of garden beds.
e) These soft leaf varieties provide a non-itching surface and a very comfortable lawn.
f) Buffalo Grass requires less fertiliser and mowing than couch grass.