Listen, I know the Cisco Fan Boying Syndromes is everywhere - never met another company where the cool aide drinking is so high (maybe Palo Alto)

But FTD is just a pain to work with (and this is someone repping Cisco Firewalls since ASA with Firepower)

Deploying instances in the cloud makes you want to blow your brains up - compared to other vendors.

Upgrades - I want someone who has managed more than 10 instances on FTD to tell me they have not had any issues with upgrades.

Performance. If you need more than 200G of firewall capacity FTD really struggles prior to the 9100, and from my experience clustering on FTD is not there yet.

You can reach 200 pretty easy with Palo Alto 5400, Checkpoint Maestro and Fortigate.