Definitely The Hunger Games... For me, even if there was no love triangle, it still would be a great story, not only a "fight 'till death with lots of blood" story... (altough I like Peeta and Katniss very much and I'd miss them u.u)
I read this book talking about The Hunger Games' filosofy, and I could imagine how the author's head worked... It has many criticisms of society, how it works and how it's main governors manipulate the people, especially with the "Panem et circenses" politics (which not coincidentally gives the name to the country where the romance takes place)... and well, many other deeper things... I liked this book very much... Twilght doesn't reach the importance of the Hunger Games' plot... is something that we can't even compare...
I read Twilght. I really did. And i like(d) the first book very much... but when a read the second, I almost didn't finish it and the third, I didn't finish at all... I don't even mention the fourth, cus I didn't even read it. The romance turned out to be poor and too cheesy >_>
In other hand I devoured The Hunger Games' trilogy in three days and I kept thinking about it for a looong time /o/
On the outside Katniss seems invinsible and strong but even though she wouldn't admit it she couldn't live without Peeta either. I think that makes Katniss a deeper, more complicated person. She probally wouldn't jump off a cliff but still. The main difference between Katniss and Bella is that Katniss takes care of herself while Bella expects Edward to save her.
One of the things i like about Katniss is that she can handle herself even in the most sad/dificult situation and that she's very realistic. She doesn't expect to be saved by someone. She knows that this kind of feeling and expectation doesn't fit in her world.
Her character is definitely better built that Bella's. She has the strength to play the role of the heroine of a complex story while Bella's character doesn't have this strenght in Twilight.