I just made about 50 8x10s this week using drums. I wish I had a processor. I don't mind drums for my normal sedate pace but I needed these thing done. Drums will use less chemicals but if this is at school won't they be filling the thing up with chemicals? The processor needs more chemicals to fill but if it's being used enough it won't waste any chemicals.
If you have a chance to try both then see which one you like better.