I've written novels in both yWriter and Scrivener, and I have to agree with Hitch that yWriter is more powerful. I like Scrivener better, but I can get more out of yWriter. The good news is that I just found a way to install yWriter 5 on my Mac with PlayonMac, so I'm going to have to spend some time configuring it to get the most out of it in concert with Scrivener.
Oddly enough, I've been doing most of my writing in Google Docs lately, mainly because I can use it on Android and it syncs to both my Windows laptop and my Mac.
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