FWIW, At this point all of the links on the website that take you to “Security” use cases take you to the dual logo ADT/SmartThings Hub, which is more reliable and does have additional features that the other home automation hub models do not have. So I think that’s their standard answer now -– if you want security, you should be using that model. (I know a lot of the other marketing implies otherwise. 
)
https://www.smartthings.com/home-security
My personal opinion, for what it’s worth, is that the ADT model is a decent low-end security system, something I would not say about the other models.
You can talk to people who are using the ADT model in the following thread:
ADT partnership: ST-ADT touchscreen hub and devices (discussion thread)