A unicorn witch vs. a dragon witch.

In my world, dragons are primarily magic users, using their fat stores as "magic" stores. Using magic doesn't deplete fat, but the fat contains constant supplies of magic. So a huge dragon with no fat might not be as powerful as a small but super fat dragon. Never does a dragon resort to physical combat. If a dragon does not have the ability to gain fat stores, it simply trains it's mind and becomes a riddle asker and trap master.

Unicorns on the other hand are the masters of combat. Their horns are the first swords humans used before they found metal to make their own. It was rare for humans to have swords because it would mean they had to kill a unicorn without the use of one. It is rare for unicorns to have magic, but when they do they are very powerful. The unicorn moral compass is confusing to humans, so any magic using unicorns are greatly feared.