"What would I do" is really unanswerable, as you can't know until you're in the position of a defendant facing the decision. Moreover, if the client is insisting that he's innocent, he's in a much better position than the lawyer to know if, in fact, that's true. Any criminal defense lawyer will eventually have a client whose (to that point) plausible claims of innocence fall apart the moment the first prosecution witness takes the stand at a hearing or trial.