Tom, they aren't alot different. Most difference to you would be the bulk of RD, clays takes up less room. That is good and bad for some loads----some light stuff you need the bulk, some not, to fill the shell as need be.
Personally, I would use availability and price as the factor. Both fast burners, Clays is a little cleaner, the last RD I had and had it stoked up was pretty darned clean. I'm about to decide it doesn't make that much difference anyway, have to clean them eventually and I've never cleaned mine after using a "clean" powder that really impressed me with the residue-----dirty is dirty :wink:
Personally, I would use availability and price as the factor. Both fast burners, Clays is a little cleaner, the last RD I had and had it stoked up was pretty darned clean. I'm about to decide it doesn't make that much difference anyway, have to clean them eventually and I've never cleaned mine after using a "clean" powder that really impressed me with the residue-----dirty is dirty :wink: