Sophos UTM and pfSense aren't even playing the same sport when it comes to out-of-the-box functionality. UTM will blow its doors off with a cleaner interface and point-and-click for almost everything. Enabling Snort (at least, what I understand is a Snort backend) on UTM is a single toggle switch. With pfSense, it's a much more in-depth config. PfSense is a free, open source customized distribution of FreeBSD tailored for use as a firewall and router. In addition to being a powerful, flexible firewalling and routing platform, it includes a long list of related features and a package system allowing further expandability without adding bloat and potential security vulnerabilities to the base distribution. PfSense is a popular project.
Sophos Xg Vs Pfsense
Sophos Utm 220 Specs
Sophos Utm Manual
My go to firewall when one is needed. No muss or fuss when compared to a Cisco, Juniper or other less worth while competitors... The stability longevity and overall security of these systems (when you know what your doing) is second to none. Every system update adds another fix or feature with no empty mess in between. Every iteration makes things more and more useful and simple for the most part! Hard to get any better QoS control than the traffic shaping tab in PFS. Will run on just about anything, and if you have a gig card n it, game over you just got a firewall that is unbeatable, and unless you break it yourself, hardware failure is going to be your only down time!