Apart from different materials, such as metal, plastic or wood, there is firstly the difference a dog comb with or without a handle. You have to decide what you can work better with.
However, it is particularly important that the teeth do not have sharp edges or welded seams and the teeth themselves are not sharp as needles. You do not want to hurt your dog.
We have selected our combs so that they are suitable for all breeds. Combs with a larger teeth spacing, with a very small spacing and combs half coarse-teethed and half fine-teethed, the teeth of course being all the same length. All of our combs are made of durable metal.