The solution's granularity with web URL categorizations and its ability to recognize more firewall applications are better than Zscaler. Threat prevention has very recently been introduced in Zscaler but has a way to go before matching the solution's capabilities. 

CrowdStrike provides more signature granularity than the solution. 

Yeah, I checked out other products, like Fortigate and Firepower. When we compared Palo Alto and FortiGate, the word from the community, which I came to know, was FortiGate was not stable. Though Palo Alto is slower than Fortigate. When we consider the long-term brands, Palo Alto is much more stable than Fortigate.