Is a good question for animations's lovers.
Not is the same thing do a traditional animation, with the classic paper, pencil, of do a flash animation, done all in the digital media.
The tools you should use for both different types too are different.
Flash AnimationsA Flash animation or Flash cartoon is an animated medium which is created by Adobe Flash or similar animation software and often distributed in the SWF file format. The term Flash animation not only refers to the file format but to a certain kind of movement and visual style. With dozens of Flash animated television series, countless more Flash animated television commercials, and award-winning online shorts in circulation, Flash animation is currently enjoying a renaissance.
Traditional Animations:Traditional animation (or classical animation, cel animation or hand-drawn animation) is an animation technique where each frame is drawn by hand. The technique was the dominant form of animation in cinema until the advent of computer animation.
"Animation productions begin with the deciding on a story. The oral or literary source material must then be converted into an animation film script, from which the storyboard derives. The storyboard has an appearance somewhat similar to a comic book, and it shows the sequence of shots as consecutive sketches that also indicate transitions, camera angles and framing. The images allow the animation team to plan the flow of the plot and the composition of the imagery. The storyboard artists will have regular meetings with the director, and may have to redraw or "re-board" a sequence many times before it meets final approval."
This apply for both types of animation.
What Do you like more??