Although I am sure I will use Flash to display my games in browsers what I am not sure about is if I should use the Flash Authoring Tool to draw my characters which I want to be vector based characters or if I should code everything in AS3.
Maybe it is just a personal thing but I would rather code everything by hand with the Flex SDK and compile it with the command line compiler. Is this logical or should I really think about using the Flash Authoring Tool to draw my characters and code it in with flex?
Hopefully get some AS3 developers out there with experience enough to answer this question.
If you goal is vector graphics you can either build them in flash and export as a swc for use in flex.
Another option is build the assets in illustrator and export them in FXG format which you can then use flex. FXG is a version of SVG for flash/flex.
If the animation is more character based then i would go with Flash, but if it is just objects moving around the screen like spaceships or non characters then FXG would be fine. It will boil down to just what you prefer to work in really.