Re: Kobo keeps you free
I find this argument specious - that Kobo is less restricting than Amazon's Kindle because more stores use the DRM which Kobo is set for.
DRM is DRM - if your Adobe access licence gets revoked your Kobo's access will be cut off from all of those stores and your books will become unreadable, most likely too.
So, the real comparison should be which system's DRM are the easiest to remove. Once they are removed it doesn't matter which store the books are coming from for either device...