My customers use Fortinet FortiGate for their branches and campuses; we have provided it for small retail and industrial networks.
Chennai is totally based on MND and BFSI for the factories, and since Fortinet FortiGate provides OT Security, they have numerous features. In the same single firewall, they can use SD-WAN as well as OT signatures to have visibility for partners.
The best features of Fortinet FortiGate include selling a perpetual license as a primary benefit, and the license cost is not much compared to Cisco, Meraki, or HP.
Feature-wise, I can rate Meraki over Fortinet FortiGate a seven or eight since they have micro-segmentation and application routing. They can detect real-time threats with FortiGuard, which is similar to Palo Alto. Now they are implementing AI features, and I recently went through the demo, which is amazing.
The main benefits that Fortinet FortiGate brings to customers include that if you're going for a single fabric with core switches, access switches, and APs, compared to legacy Cisco or Aruba, te Fortinet FortiGate does not require a controller for the access points. Fortinet FortiGate itself acts as a controller.
Similarly, they have FortiLink, which connects all appliances in a single stack, allowing maintenance with FortiManager and FortiAnalyzer. In comparison, Cisco requires a separate controller for SD-WAN and Nexus ACI controller, and other things require a Cisco DNA controller. However, with Fortinet FortiGate, it's simple to maintain using FortiManager and FortiAnalyzer, thus being very much easier and cost-efficient.