>>280745688 (OP)I don't get why people go so ballistic over choosing a lane and calling the other worthless garbage. I enjoyed both works for what they were, with their different styles, and while I do notice the inconsistencies between them when it comes to some characters, I'm not married to them enough to actively get upset over it and condemn the whole product. I just don't care that much about Saber. She's just ok. Crucify me.
All that aside, the different tones make enough sense to me. in Zero nearly all the contestants were either deranged or neck deep in the shit of the magecraft world, where people actively try to be as awful as possible to each other for their own goals. Even the original VN states that the 4th wall was just the latest in a series of pointless tragedies due to mages being shit, and the backstories of the different mage families presented in Stay Night are just as bleak and pointlessly cruel. It's no surprise that Waver is the only character who gets out of it better than when he entered, going back home with some trauma but also a new appreciation for the small things in life. I don't think it's a stretch to say that Urobutcher's goal for the character was precisely to show that it's not ALL edgy shit, and that future mages can change.
It follows then that Stay Night has a much more positive message, because nearly half the characters are either unfamiliar with the wretched morality of the magic world or young enough to be convinced to reject it. The ones that aren't happen to be edgelords themselves and are treated as the villains for it. Easy to see how it can achieve brighter, more hopeful endings for the majority of the cast through the power of friendship and underage sex.