My first thought on reading that is its quite a big difference in ages of the two boats you are looking at, one being 6 years old and the other 11. I would have hoped the 2004 boat would have mechanicals looking almost like new, whilst the 1999 boat will have quite a bit of corrosion in places you really don't want it. Make sure you have a really good look around the engine bay with a torch to see what potential problems there are, as its a real sod changing things like starter motors.
On the question of Searay vs Crownline, they are both nice boats, but others on here will have direct experience. What kind of price difference are you talking about between the two boats?
Today's Weather Forecast: Scorchio.