I have been a devoted user of Apple Products for over 15 years now. In that time I have seen a lot of operating system and device upgrades. Somewhere at or about late 2010, most Apple products started to get the option to migrate old data and configuration settings to a new device at setup or to just setup the device as a new device all together. Now, If you are like most people, you have probably gotten your iPad, iPhone or MacBook to look and feel exactly to your liking. That means that at some point you encountered most of the preference panes like the one below and set up feature how you would like them. Not to mention all the accounts and passwords you have entered for each and every app on your device. So when faced with the question of whether or not to redo all those config settings or just migrate them over, many people choose to migrate them over.
I advise, However, that you shouldn’t take the migration approach. As you use your device over time you probably start to see little annoying issues from time to time. When you migrate your device configuration over to a new device, any bugs and issues you are experiencing can often come with that move. So, it is best to set up every new Apple device you get as a new device. With all of the cloud computing and storage options out there, you can easily get all your documents and apps back where you had them and quickly. For example, I still use Time Machine to back up my Macbook Pro, iTunes Match for my music, Dropbox for documents and images, and so on. All of these services give me a worry free usage environment and easy set up of a new device every time. If you use a password manager like Password Safe, re-entering your accounts isn’t much trouble either. Lastly, every time you set up your device as brand new one, it gives you a chance to really learn the new OS and its features in full.