Let's start with the obvious:
The kids in Divergent aren't fighting in a game of life of death on television.
Yes, they both take place in dystopian worlds but their dystopian worlds are different than eachother. in Katniss's it's poverty, with Tris, she has it a little better than Katniss.
But really, I don't like them being compared to eachother. it was the same with Harry potter and Twilight and look how that turned out.