As you know I use binned for my RGB data Graeme. I use it to speed up the collection process but have considered doing 1x1 for all my subs. The idea of binned is most likely a legacy left over from slower camera downloads and gathering image brightness faster. With the download rate of your camera it would be fine to use unbinned.
Certainly one advantage of unbinned is combining narrow band data with colour data. No doubt there are other advantages. I'll leave that for others to comment.
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