i attended an insight event at the southend campus for essex uni and i didn't really like the faculty (i found them quite condescending and they kinda treated us like primary school children but thats just my experience of 2 lecturers for maths)
i don't remember brighton much i only remember seeing bunnies outside when i went for my sister's open day a couple years ago, so i'd say go brighton but i have no idea how the faculty are for the subject you're considering