Mine is dcc. I like the ease of use plus the available sound and light functions that dcc offers and price wise there isn't much difference if you look for bargains.
If you have any favorite pieces you can specify that they go to a relative or friend. A larger collection could go to a museum or historical society or perhaps a children's hospital.
On an older three-bay grain car in salt service how full would these car be? 1/2 to 2/3 full? How long would one of these cars typically last in salt service ?