Since you can hit Amazon and try a dozen titles your old STATISTICS tell you that you can with a degree of certainty get your answer in how many samples? (hint: classic statistics problem.)
I'm interested in an ebook reader and thought I was leaning towards the Nook... until I read the not so hot reviews calling the UI is sluggish and buggy. Of course the Kindle is not perfect but the battery life and the selection are its strengths. Maybe Apple will surprise me on Tuesday but I'm not sure I want backlit battery draining LCD on which to read books. The simplicity of the Kindle and the Nook are actually their advantages.
However, I don't want to buy into a purely proprietary ecosystem. So ePub support is pretty important to me. This is the biggest strike against the Kindle in my opinion. Question is how prevalent is ePub at stores other than the B&N or Amazon? Is there really any significant selection of ePub books for sale out there?