Cursor has been my favorite so far but I also have never tried Codium. Copilot was the winner prior but honestly its just tab completion. I tried Jetbrains but it felt janky and slow. Cursor tab completion feels nicer, its super fast and will do updates based code changes. I like being able to quickly get it to write some code updates and it returns in a green/red line like a github PR. The flow is really nice for me and I am looking forward to the future.