we have finally a slide were we can easily make the right decision for the right approach.
Just consider, if you deiced for On-Premise deployment. If you have the Office 365, please always consider the hybrid approach. This let you utilize the Skype for Business Broadcast Meeting feature as well. It is not available, if you didn't set up the hybrid configurations.
You can download the PDF from my slideshare: DOWNLOAD
Author: Thomas Poett MVP, Business Unit Lead Microsoft Unified Communication