关于prefer＼rather than \than \to的问题

关于prefer＼rather than \than \to的问题
prefer sth rather than sth\prefer sth to sth\prefer sth than sth
would do sth than do sth \would rather do sth than do sth\would do sth rather than do sth
这些句子哪个对,为什么 rather than\than\to 有什么区别