The pfSense + Ruckus combo is pretty awesome! That's what I've settled on the past few years -- pfSense gives you a ton of control and the VLAN segregation and access controls at the firewall level pairs really well with Ruckus APs.
As far as standalone vs managed, in a situation like yours, if you only have a single AP it doesn't matter too much. If you end up having more than one AP, I would recommend Unleashed for sure, as central management gives you:
- Make SSID/settings changes in one place, have them apply to all APs
- Add APs by simply plugging them into your network, no additional configuration required
- Mesh (wireless backhaul) support
- Centralized roaming intelligence (band/load balancing, 802.11r/v fast roaming, etc)
- For Unleashed, the ability to manage the network (and receive push notifications for critical events like APs going down) from a smartphone app. The app even works over the cloud for remotely managing your network on the go!
- Unleashed FW tends to be updated more frequently and generally that means you see better performance/reliability. Solo FWs do get updated from time to time but not nearly on the same regularity as Unleashed.
The main disadvantage of going Unleashed to start, I would say, are:
- It takes noticeably longer to boot. If you have a site that experiences frequent power outages, Unleashed might not be for you.
- Resource usage -- on older APs, the impact of running the Unleashed controller code can theoretically have more of an impact for total capacity of the AP. In a home environment I don't think it'll happen though.
For the last reasons, some people even choose to use Unleashed for single-AP deployments. Personally I tend to start with Unleashed for future-proofing.