CS3 has many advances in add on tools while flash CS4 degraded to the point of racial extinction.
CS4, more likely NOT to crash.
Fixed it.
I have CS4 on a sloooooooow comp and it works fine,the only crash I got was when I only had a few MB on my harddrive,Flash 8 crashes alot though u gotta love the brush sizes.
CS4 has more customizable filters and support for some 3D stuff I haven't tried out yet while Flash 8 has sensitive lines when u want it to ease,it has to move to a keyposition and locks in,and when you move it it gets all ruined,CS4s line tool is more flexible. CS4 has a stylish interface,Flash 8 got some old windows 95 style(lol sorry 95ers) CS4 got a lot more shapes and flexible sizes in rectangle tool,oval tool and they have the new polygon and two other similiair too rectangel and oval tool that changes something I dun kno,haven't tried them out yet XD.