Hello,
Great question! Both the DU6900 and DU7200 feature Crystal Displays for brilliant colors and exceptionally crisp, vivid images. Their Crystal 4K Processor further brings impressive clarity to all your content while upscaling everything you watch to stunning 4K definition, no matter the source.
When stepping up to the DU7200, you'll gain Dolby decoder MS12 2ch, dual Bluetooth audio, mobile camera support, and more. Plus you will gain Filmmaker Mode, which allows you to watch the source content (e.g., movie) just as the director intended, as well as Tap View, which allows you to cast content from your smartphone by simply tapping it to the side of the TV.
For more information, you can always reach out to our support team at 1-800-SAMSUNG, 8 AM – 12 AM EST, 7 days a week, or Chat with us on Samsung.com: https://www.samsung.com/us/support/contact/
~ Samsung Pro