Howdy Chris,

The reason for the two is flexibility when creating clusters. Strand clustering relies on guides to cluster the hair around while with hair clustering clusters are built for hair and you can adjust how many etc. Hope that sheds some more light on it for you :)

Thanks!

Michael

Sure is. Docs are updated continually. Here are the two clustering topics:

https://ephere.com/plugins/autodesk/max/ornatrix/docs/3/Guide_Clustering_Modifier.html

https://ephere.com/plugins/autodesk/max/ornatrix/docs/3/Hair_Clustering_Modifier.html

Each talks about how it creates clusters (based on guides or based on generated hair clusters). 

Thanks

Michael