swish just makes the few animations that it supports a matter of a few mouse clicks, whereas with flash you would have to go through a complex series of animating and tweening.
with swish, however, the file size will be considerably larger since the text objects in swish are individualy different for EACH frame, whereas with flash each text object occurs once but is then modified or animated using the flash engine (not by redrawing them).
so you end up trading speed for size (albeit a minor size difference in most cases).
Upon Export those frames are removed that are not nec.
The swi or authoring file may seem larger but the swf ouptut file is not.
All the animation files in V2.0 are save able as libraries
and you can create your own sfx that is stored inside the program so you don't have to open another authoring file as a library like Flash to get to those files.
check out the library of open sfx at http://sfx.swishspot.com
Swish is made for swf4 as it's the only type available for release from macromedia. swf4 can be imported into flash5 authoring while swf5 cannot.
When David Michie (CEO of DJJ or Swish) left Macromedia He wanted to create a Less expensive easier to use flash program. He did. As a barometer of pricing auto's you do not go out and by a saturn and complain it doesn't handle like a lamborgini. Swish is priced at แ.95 Flash 5 is somewhere around 躔
Still having both Swish 2.0 and Flash I will tell you that.
95% of my swf's are made in Swish it's just easier. The other 4% are usually swish imported into flash for features that cannot be done in swf format.
And the last percentage is done in Ulead Cool3D because it's file size output is extremely high and it's not versitile see footer