I am trying to introduce decent reference management to my organisation. Having used Nexus with Maven before, I know it to be far superior to the method of building everythi
Nexus has support for NuGet and you can host or proxy your NuGet repositories directly in it. Have a look here.
I am a Maven and Nexus fan, so I am biased. I have used Artifactory. It's a good tool, but I found Nexus to be much better at the time. I believe the NuGet feature is also available in the OSS version, but you might want to double-check that.
I will not argue why and if Nexus is better than Artifactory, as it would not be fair and would only cause flame wars. My own reasoning is this: the Sonatype guys are the ones behind Maven, Nexus and Maven Central. This puts them at the heart of things and therefore their knowledge would always be deeper in regards to the internals of these tools and their inter-operability.
If you are familiar and comfortable with Nexus, I frankly see no reason for you to switch. However, you can decide for yourself. Have a look here.