I don't chose my AV based on tests but rather how they perform on my system and how I like using them.
I still like to follow AV tests and like AV-Comparatives the most. I especially wait their results from their Enhanced Real-World test for protection and Performance and False Positive tests for usability.
EDIT: I also like The PC Security Channel on Youtube.
In the IT specially in the business field - I get feedback from my collogues (B2B) and from experience they gather. Like lots of things in IT Infrastructure or Security Products in general are build on "Trust" - Company, Cost and Feedback - The other part logical implementation and if the product makes sense for the business - what I also look at is knowledge transfer / from and to IT Experts. (Company to Admin and Admin to Company)
For me this Community is a go to for gaining knowledge and how certain things work. In the other side I use Business Contacts to exchange information and the Security Company Forums to gain more...
For Private Use - I use MalwareTips Community to build my opinion for my home security and add my two cents in the mix
ATM I use a Netgear XR1000 DumaOS ver. 3 with Netgear Armor (Bitdefender Total Security) and Netgear Armor for PC Endpoint Agent.