

As soon as you purchase a title of either format, it all just shows up on the same device. That function works more seamlessly on Kindles, where audiobooks are integrated into your e-book library without the need to install a separate app. Whispersync is an Amazon feature which lets you switch easily between reading a book and listening to the audiobook if you own both, so you can always pick up in one format wherever you left off with the other. There is one great pro to listening on your Kindle.

So overall, the Kindle method is better for when you're just listening around the house and don't have to go anywhere. Your Kindle is also going to be heavier than your phone or iPod you can't exactly go for a run toting an e-reader. Most Kindles (especially the newer ones) don't have headphone jacks, so Bluetooth earphones are a necessity if that's how you want to listen to them.
