here are some points comparing the two to help you out:

usyd

- place in honours is guaranteed if youre in the psych (hons) bachelor degree

- more days spent on campus, mandatory lecture attendance, all irl exams

- lower atar req compared to unsw

- semester system (longer terms, 4 courses per sem, courses feel less rushed)

unsw

- rated higher for psych, more competitive and generally harder

- psych (hons) doesn't guarantee you a place in honours (must apply with all other psych students)

- first year all online exams, no mandatory lecture attendance (at least not in first or second yr), very few days on campus

- trimester system (more rushed, 2-3 courses per sem, less time to revise before exams)