umm justin bieber is only a child. he might be cute i don't know,don't listen..but robert pattinson is a man..i mean a real man. i'm not trying to say that justin is ugly and robert is perfect. i'm saying that this two should never be compared. bieber can be compared with someone of his age and robert with a full grown man..ofcourse that if you take it as you put it robert pattinson wins easily physically and certainly mentally. but it depends on age too..