"would rather" : "Would rather" is used to show a preference for one thing over another. What do you want to do today, go to the beach or go to work? I would rather go to the beach. Or...I'd rather go to the beach. I would = I'd.
http://www.videojug.com/webvideo/how-to-use-would-rather-in-the-english-language
"had better" : This is an idiomatic modal which closely resembles "should," but it's a little stronger than "should."
I sent the links to my daughter immediately and hope the visitors who kindly click on the ERIC/Surin2 blogspot like the vedios too.
Have a nice day!