In general, that's not exactly comparing similar products. Vyatta is more comparable to Cisco IOS, and we're more comparable to a Cisco ASA. They're two diff product lines for a reason. The general consensus I've heard from a number of open source networking fans is "Vyatta if you're looking for a router, pfSense if you're looking for a firewall". There is some overlap, and some areas where either/or will suffice, just like the same could be said of IOS vs. ASA.