GALE vs. PEETA!!
Why should Katniss choose Gale?:  

I think that Katniss should choose Gale, because she knows him for a long time and
they have a common past. They know each other and they 
love each other. Gale is Katniss` best friend and she can confidence on him.
If they were girl- and boyfriend, they would be a dream team. They could hunt 
together in the woods because they both are very good in it and Peeta isn't the typical 
adventure-guy. He mustn't fight that much for this life, like Katniss and Gale because 
he had ever enough food, not much, but enough because his father is the baker.
So Katniss and Gale can teach each other in the woods and they can have a beautiful life 
in the nature of district 12. 
You also can see that Katniss is very important for Gale because when she had to go to 
the games, Gale promised her that he will care on Prim. 
Katniss can feel save with Gale because he is strong and he would do everything for her.
On the one hand he is like her best friend, and her big brother, but on the other hand there 
are more feelings between those and not feelings, which are between brothers and sisters.
At the beginning of the games, Katniss didn't really like Peeta, but when she knows
that he don't want to kill her, she starts to like him. But I think that Katniss was affected by Haymitch and the Gamemakers, for example when there was a message, that she should kisses 
Peeta. So it isn't a love on a natural way.

I think that Katniss should choose Gale because he is the real ally.
AB :-)