AI integration into all aspects of the IDE is the killer feature of Cursor for me. Also access for $20 a month to every important model out there, and once you go over your credits, they grant you about another $25 in free credits and then you can work pretty much unlimited in Auto mode where it automatically picks the model for you.
Personally I felt having immediate access to the VSCode extension ecosystem to be a huge boon and I quickly got a setup to my liking.