I used Calendar feed previously, precisely because I liked the layout and Organizer feed at the time didn't have the "Aggregated" mode. But now it does, and when I got my N9 a week ago I decided to try Organizer feed as I had problems wth calendar feed being up-to-date. Has been working very well, and there's no more problems with being up-to-date. Also with the "aggregated" mode it's compact enough that I don't miss Calendar feed anymore for the layout.

Both are very good, but if you have problems with Calendar feed, try Organizer feed and turn on the aggregated mode.