With the criteria you've given, I don't think there's anything in it. Either company will take a registration with a throwaway email address, in my experience.
You have more storage with a Kobo if you choose one of the ones with a microSD card, which might allow you to put some of Wikipedia (how big is it now?) onto a card. However either device will access Wikipedia with wifi, and if you choose a Kindle with 3G you can access Wikipedia that way as well. . Kobo has both Wikipedia and Google search options with a long press on a word within a book; not sure how Kindle handles this.
You are welcome to buy from any shop on your computer (except iBooks), strip DRM and convert format if necessary, and sideload onto either device.
The smallest ereader in the Kobo/Kindle stables is the Kobo Mini, but I don't think that one has a microSD card.
Do you have any other criteria? Reading experience? Customisation of display/typography or of firmware? Ecosystem?
Last edited by meeera; 09-15-2015 at 12:04 AM.
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