Of course study PolyU Speed自己既Top up degree is better la because it is award by PolyU directly and can join PolyU alumni
CityU Scope海外大學(英國大學)既Top up degree is award by oversea university, not CityU
You can also go to universities in UK and study final year and get a university degree there. You can also experience overseas university life, education, improve your English and get an UK Degree (on campus).