Of the two I think the cybermen are more scary than the daleks.
The daleks will exterminate you but the cybermen will cut and mould you into one of them, without emotions and soul (?), and afterwards you'll try to do the same to your friends and family.
I would much prefer the first option I think, at least it's quick and you wont be any danger to the ones you love afterwards.
There were no public health laws in Ankh-Morpork. It would be like installing smoke detectors in Hell.
- Feet of clay.