The Cisco ASA is a stateful firewall, the SonicWall TZ400 is a UTM offering comprehensive security features, the Juniper SRX Series is a stateful firewall utilizing ACLs, and the Fortinet FortiGate 60E is also a UTM that provides application control and web filtering.
The SonicWall TZ400 is classified as a UTM device. UTMs are comprehensive security solutions that provide multiple security functions, including firewalling, intrusion detection and prevention, gateway anti-virus, and anti-spam capabilities, all in one platform.
Lastly, the Juniper SRX Series may be mistakenly referred to as an ACL Firewall here, but in reality, it is a stateful firewall as well, with capabilities that include Access Control Lists (ACLs). It allows administrators to write granular policies to control network traffic. On the other hand, the Fortinet FortiGate 60E is also actually a UTM device, providing an array of security features such as application control, web filtering, antivirus, and intrusion prevention.