Unless I'm blind, I haven't been able to find this question answered despite rigorous searching. Needless to say, I think the question speaks for itself but here's my situation:
My primary reading device is now my
iPad. Usually, I stick to buying
Amazon Kindle books because they can be used on all devices with the Kindle app but there have been instances when I've bought books through iBooks and
B&N due to availability or price. However, I prefer having all my books in the same location/app on my iPad.
Maybe I'm anal but it was annoying when I had some books in iBooks, some books in Kindle and others in the B&N app. Furthermore, my wife also uses the iPad and we prefer to keep our "libraries" separate. Therefore, I currently keep my books in the
Kindle app and all her books in iBooks. This way each of us can easily go to one place to find all our books without the clutter of the other person's stuff.
Generally speaking, removing the DRM from Kindle books has been painless. However, I've read that removing the DRM from Topaz books can wreak havoc on pictures. Most of the books I read do not have pictures, therefore, I've yet to come across this. However, this dilemma brought to the question at hand: When buying ebooks, is there a preferred vendor/format I should be buying to have the best results when removing the DRM?