We don’t think of these two options as competing in performance.  They exist solely because of client IT requirements.
If your security requirements are not violated by being connected to the internet, using SHI’s servers is by far the easiest approach.
However, if security requirements DO NOT allow your computers to be connected to the internet, you likely already have servers hosting applications on a local intra-net so hosting the Santos licenses on your own servers would be the only option.
In some cases, IT departments prefer greater control over the applications used and choose to host their own licenses. We can assist you regardless of which option you choose.