What is more terrifying?

undead are just bones and rotten flesh, obsessed with one thing – to breed an army and something else…
and demons are cunning creatures (although not always), and so on… it would take too long to write…

in general, there is some respect for demons… maybe as a strong and intelligent enemy… (and I believe that there are also good guys among them)
and undead… it’s just a Zerg that only evokes negative emotions… they just need to be destroyed.

P.S. although… maybe there are a couple of interesting things about the undead (immortality… or some reasons for turning into a lich, etc.)…
but in terms of danger, demons still lead…