DEFINITELY use the standard Kindle App, better layout and latest updates.
Word of warning though: when I tried to deregister the profile for the Kindle for Samsung on the Amazon website (Manage your devices option)... it deregistered BOTH apps, and even after uninstalling the Kindle for Samsung app, re-registering the original Kindle App restored the two profiles (taking one additional slot for devices). It's not a problem if you don't have more than 5 Kindle devices (or apps for several devices), but if you do, this will max out your limit and you won't be able to sync your books. I solved this by contacting Amazon and asked them to manually deregister the Kindle for Samsung app.
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