Omg such a good question. I think I'd have to say Peeta. I can't really explain why but I will try. Peeta was willing to die for Katniss. I know in theory Gale probably would too but I just feel like it was more of a real threat with Peeta where he actually was willing to. Peeta always put Katniss before himself. Peeta is real, nice, sensitive, and just overall I like his personality more. To me, Gale might have cared for Katniss, but he also loves himself.