One thing that separates video editing software today would be the effects-pack that come with them. Most of them would have different transition effects and normally this is what would separate them as far as getting the right one to use.
Pinnacle and Ulead have had their own sets of transitional effects and apparently this is their marketing leverage over the rest. Timing is of course needed so that you can make sure that they showcase their attributes finely.
A word of caution. Do not overdo the transition effects stage. Too much transition may take away the essence of your video production and that is something you would want to avoid.
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