My vote would be for DI ... given a head to head comparison.

Main reason being that the DI "picture image" is going to tell you a lot more about what's under you, than the best 2d "finger painting" image could ever hope to show.

Being able to look at your screen and see images like these :

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Name: 005.jpg Views: 1832 Size: 64.7 KB

... and know what they are the instance they appear on the screen, and not have to guess or spend a lot of time going through the learning curve of interpreting the shapes & colors of the blobs that 2d produces ... is just a no-brainer IMHO.

... cp