Apologies, I should've been more explicit.
What I like about Untangle is that each service is independent from each other which are basically two things: rules and logs.
Untangle has a rich pre-defined rules that you can just enable/disable at will.
Untangle can be easier to use for people who are new to firewall+utm.
A website got blocked? Check the Web filter rules and logs. Untangle's Web filter also allows you to block a site and add a comment/reason that the user will see on the page.
I really have to give Ease of Use points to Untangle. I can monitor what went thru and what was blocked by each module without having to grep/awk logs.