I use both but prefer stainless because of the fact it gerates less heat and disipates much better than ceramic, which is important to the system of tying I use. A word of interest here about stainless bobbin: they are not created equally. Different grades of stainless are used in their making. The ones I used are not flared at the end like most but are straight and radiused and highly polished. Tey are also thick walled which allows this radius and polishing to be applied.