Artifactory is an enterprise-grade universal binary repository manager for use by more than 25 different dependency managers, including Maven, Docker, npm, PyPi etc
Nexus is a Repository Manager for Maven, NuGet and other binary artifact repositories
"I would recommend artifactory much better than the nexus"
from question "Blacklisting a maven repository"
"I will not argue why and if nexus is better than artifactory as it would not be fair and would only cause flame wars"
from question "Nexus or artifactory with nuget?"
"Nexus looks better choice than artifactory because of using filesystem instead of database to keep repository"
from question "How does Archiva compare to Nexus?"