First, lets take a look at the Camera.
The 9780 boasts a 3.2 Megapixel Camera along with Auto focus.
The 9900 boasts a 5.0 Megapixel Camera along with EDOF.
In the farm:
Via the 9780
Via the 9900
Videoing at a farm
Videoing a iphone 4 screen:
As we see the photo and videos above, there is overwhelming evidence that the 9780 still beats the 9900 hands down in terms of Photo-taking and video taking. While the 9900 is great for taking landscape footages, 9780 feels more of a great all rounder. Music wise, 9900 feels to be able to power up my JH-16pro slightly better than 9780 but the difference is negligible. The Blackberry Playbook still powers my earphones the best out of all Blackberry devices.