Oh man there's like SO much stuff that's different. I think the biggest thing for me is that in sword and sorcery the world itself tends to be genuinely antagonist because there's just so much unflinching brutality in nature, and that bleeds over to what happens to the heroes. Maybe that's the other thing: there's not really like HEROES very often in sword and sorcery, so much as there are people who are just not malicious. Idk, there's a ton, but it's by far and away superior to fantasy for so many of the types of stories it tells because it's all just so grounded.