Akai XR20 Beat Production Center OR Akai Renaissance! Which One Has More Simplicity?

Good Afternoon.I have the Akai XR20 Beat Production Center, which I've created music on with "NO" computer hook up whatsoever! Once I made sure that my patterns were saved, I can go back to my XR20 several months later, and add anything else to the patterns that were saved. That feature I love with the XR20! Can I do that with the Akai Renaissance? Do I really need computer hook up for the Akai Renaissance? If I do need computer hook up for the Akai Renaissance, then the Akai XR20 is much better to me!
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