I go with Barnes & Noble for one simple reason: money. I have a Discover credit card, and I get 10-15% cashback on B&N purchases including ebooks from the Nook store. Similarly, I can spend my cashback bonuses on gift certificates for B&N ($45 buys $50, or a 10% discount, and they just added electronic certificates so I no longer have to wait two weeks to get physical cards in the mail), which in turn give me cashback again when I spend them. I'm surprised that works, but I guess because I have my Discover Card as my primary payment instrument and I enter the site from Discover's cashback portal they give me the money even though I buy using a gift card. I'm essentially getting a 20-25% discount depending on if cashback is 10% or 15% in a given month, and spending money on other things gets me free money for ebooks. Out of all the books I've purchased at the Nook store, I've spent non-cashback gift card money maybe twice.
If it weren't for that, I don't think I'd have a store preference. All DRM for the listed stores is easily broken, so I'd shop around and buy wherever the prices are lowest (for agency books I'd probably stick to Amazon or B&N, preferring B&N for epub).
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