I can't really say G Senjou is way better. Well, for one, G Senjou has only one heroine I can call good, while I liked all of SnK's heroines (though admittedly none as much as Haru). G Senjou had the more epic plot, but I dunno if I can call that a plus, and it had a lot of plotholes. G-Senjou has better BGM, for sure, but I still liked SnK's. SnK had the better protagonist. Had the better antagonist too.
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"As the size of an explosion increases, the number of social situations it is incapable of solving approaches zero." -Vaarsuvius, Order of the Stick