I am not a doctor myself, but know some doctors and doctor-to-be's.
1.本科到美国college读有Pre-Med课程的学院。接着读4年医科,再实习医3年,在美国当医生。 -- 很苦﹐ 也很花錢。but will have a stable job (relatively) and stable income later on.
2.在中国读完医大,然后到美国学临床,再实习医3年,在美国当医生。-- 省錢 但更苦 because need to catch up on a lot of things. 一般3年不夠。One of my girl friends spent almost 4~5 years before she could started her own clinic. If counting the time she spent on preparing and interviewing for fellow, it is 6-7 years. As far as I know, interviewing for fellow is an intensive process.
3.在中国一直完成学业,最后到美国进修1,2年,回中国当医生。-- 不是很苦﹐也省錢。但不能在美国当医生。