Joe makes excellent points. To add a non-situational response for other readers, I do want to emphasize performance as a consideration, especially if guests are a major part of the network. I would also add future planning, and better management to the list. Many churches want to engage with mobile connectivity, so the performance gains and overall throughput of more modern radios can make a significant impact for guests. There have also been improvements to traffic shaping and guest authentication to help keep the guest space secure without stealing a lot of bandwidth from the staff. The older Ruckus did some of this too, but not to the level newer systems can.
Regarding future planning, if your church is pushing mobile giving or anticipating multi-media presentations in Sunday School classes, the guest experience will become more of a factor. As we all know, high-tech society is pushing more toward mobility, so WiFi needs to perform securely and reliably. If credit cards are being taken on campus, PCI compliance standards are also a factor in the security demands.
When we recently reviewed our options for WiFi, I also considered manageability. I wanted to be able to go to my son's soccer game and not need a VPN connection from my laptop to deal with an emergency on a Wednesday night. I'm also a huge fan of multi-taskers, so I looked outside the scope of WiFi to see what other devices vendors would help me manage in the same dashboard. There are a few that do a lot more than simply manage WAPs. Aruba, for example, will comprehensively manage all HP/Aruba network devices. Ultimately I ended up dropping our Ruckus and switching to Cisco Meraki because it had better out of the box features for managing more of our network, guests, and devices.