I did a quick search for 31 books on my to-read list on Amazon (to Canadians) and Kobobooks:
12 available at both
4 only at Kobo
5 only at Amazon
10 available at neither
3 available as ePub from my library
I thought this would help me decide between Kindle and Kobo but it doesn't other than saving a couple of bucks by using the library. That would be offset by Amazon books being cheaper by $1-$2 each. Is it easier to remove DRM and convert from ePub to mobi on a Mac or the other way around?