None actually, they stream just about everything now. =P but if I had to choose, maybe CES because they really cannot stream the products and gadgets, and the coverage is subjective to what the journalists think was best. Well and I have not been yet.
I went to E3 years ago back when Star Trek Bridge Commander was in development. It was cool; ran in to some celebrities and television personalities, but it is way too crowded and I did not feel like waiting in line to play games... I got more out of it by just watching other play. I found The it fun going off to the small developers and seeing the cool stuff they were doing that often gets overlooked by the press,