We have 36 holes, which includes 40 greens with practice areas, and we are fairly up-scale for this part of the world (France). The larger greens are regularly mowed with a triplex, but the ten smallest greens are mowed with walk-behind (or pedestrian, for you Engilsh types). The quality of cut across the putting surface is the same for both mowers, but on the small greens the triplexes must necessarily turn more sharply for the outside lap, which stresses the turf, even if we only do it twice a week. The little greens also tend to be in tighter, often shadier settings, where there isn't a lot of room for the triplex to make its turns without bruising the surrounds, unless the mower constantly mows in the same direction, which would result in establishing a grain.
That is during the growing season, from mid-March through October, We stay open through the winter months, when we mow walk-behind only and then once or twice per week.
When we roll greens however, the same roller wil do all the greens on the course.
Occasionally we've had visitors from high-end clubs in the States, who have expressed surprise that any of our greens are mowed triplex.