In what world? Outside of the shitposting of some political internet bubbles Stirner is practically unheard of, while Engels is a cornerstone of scientific socialism and materialist philosophy in general

im pretty sure there are still statues of engels all over the world, while stirner still lies in paper, seen as nothing but a sketch made by engels himself.

stirner is like the rest of anarchism, a overvalued idiot who is only worth anything due to profiting off the actions of their marxist betters