I find Juniper SRX Series Firewall to be a reliable solution, as I have configured it for many customers and they have operated for more than a year without any problems, so I consider Juniper to be one of the more reliable firewalls.
Juniper SRX Series Firewall is favored for its stability, reliability, and integration of firewall and routing services in one device. Users value its performance and competitive pricing over Cisco. It includes security features like VPN and NAT. Despite this, configuration is challenging, IoT protection is lacking, and updates are slow. Though technical support is responsive, there is room for improvement. Out of 18 software versions, only two have been RPC issue-free.
