Drum Cheese Graters are similar to the Rotary variation. They are quick and efficient and are perfect for bulk food preparation. Whether you choose to buy a Drum Cheese Grater or a Rotary, it doesn't matter! ... and you know why?
Because they are exactly the same thing!
Sometimes 'drum' cheese graters have 2 drums and are suited more towards catering and mass food preparation. Drum cheese graters come in all different sizes and colors and most importantly qualities.
Buying a Quality Drum Cheese Grater is important because they are really useless when they start to wear down. DO NOT buy a cheap drum grater, this will just end up in taking the grater back and buying another one. I've been using a Rotary Cheese Grater myself and have found it really useful, there is one downside and that's cleaning it.
I hope I've helped your decision on buying a Drum Cheese Grater!