I have the Academy Glacier Girl kit. I havent finished it yet but from all the test fitting that I've done its not all that bad of a kit, for the most part the parts fit is great. Only real problem I have seen so far is when attaching the booms to the wings, will need some filler there. I remember someone saying something about the canopy not fitting right either but I havent touched those parts.
Not sure about the Hasegawa kit, someone did tell me it was more expensive for a little more detail. I do not know from personal experience.