Is there a "best" way to convert m4p to mp3?

There are offers all over the internet for free or not free programs that will allow me to convert iTunes format into mp3 so I can copy it hither and yon afterwards. I am not going to sell it or anything. I do intend to copy to another hard drive, and another non iPod player. Anyway, without telling you my life story, is there the best way to convert m4p to mp3 so I can use the tunes on another player?