Our recommendation is to use storjlabs/storagenode:beta. Using alpha or arm will download the same image when using the same machine. They exist because of backward compatibility.
We have to update our documentation and removing the usage of arm tag for the ARM architecture.
NOTE using other image tags is under your risk; those images are published in docker hub for internal purposes (testing, etc.), perhaps they will be a release but perhaps not.
using storjlabs/storagenode:beta does not work for me:
storj@pine64 : ~ $ docker pull storjlabs/storagenode:beta
beta: Pulling from storjlabs/storagenode
no matching manifest for unknown in the manifest list entries
Is there somewhere else that I can pull down the beta image?