Well there are reasons for both, especially people who derive their opinion primarily from the anime. However, from what I recall the LNs portrayed Louise as less of a "cancer" to saito and I dont think saito was as much of a jerk as he was in the anime. There are many romantic scenes still left untranslated (my favorite being the cute bath scene in vol 18) in the novels so I would reserve judgment on hating either girl for the moment.
Btw I'm rooting for Louise
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