I was in the Homasote camp until recently. Now I am not so sure. I used Homasote on this layout because I had 48 square feet of the stuff left over from earlier days. When I was modeling in HO and N scales another great advantage was that it holds track nails and spikes extremely well. As John pointed out it will hold screws better than foam as long as you are careful with the power screwdriver or drill. I have one span where I had to mount the track directly on the plywood at an underpass because I didn't allow enough clearance for my highest cars. Because of this topic, I have paid close attention to the sound. I can't tell the difference running MTH sound at about 30% between there and on the Homasote and I haven't ballasted yet. Of course I do have a tin ear. 
In the future, I think I will probably follow Dave's advice and not search the world over for Homasote. This I had on hand is 30 years old at least. I have about 3 square feet left over now.
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