I've used the both original StarUML(Unfortunately, it was abandoned so long time because it was developed as a commercial program first by a company in South Korea... but the company went bankrupt.) and StarUML2.0 I think WhiteStarUML is not very different from the original one.
StarUML2.0 is much better to see - anyway it is prettier. It's undeniable. :) and UI looks better. - But I felt it is a little bit uncomfortable when I draw some kind of diagrams... for me, especially sequence diagram. I guess it is because I'm familiar with the original StarUML.
What I want to say is, I think StarUML2.0 can be a little bit unfamiliar for users who have been using StarUML1 for long time. But If you want to show your diagram in your presentation, I recommend you to use StarUML2.0.
+) Now staruml 2.0 is charged. Personal license is $70. If you are a student, you need to pay only $49. The original starUML 5.0 is still for free.