I cannot comment on what channels you should pick, I'd gravitate towards DFS since that offers more channels either way, but if you happen to be on a channel with lots of radar activity, you'll get booted often as well. So that's something to keep in mind, although multiple APs will mitigate the outage if they partially overlap. After experiencing multiple DFS radar events (which basically killed my network since I had no fallback channels configured), I predefined a list of channels: two DFS, one regular, and ever since I haven't had any real issues.
See this topic: