In my (little) experience, I find that Nokia has always been the more trustworthy of brands, a good nokia doesn't break with a few accidental drops and it is a very easy/basic phone to work out. A samsung on the other hand is renown for it's very good cameras and the Samsung Omnia does look especially cool.
If I were you, I'd go for the Samsung Omnia. I've owned neither phone, but from appearance the second one does look more cool. I know that if my friend had one, I'd be extremely envious
