You never have the Defendant testify. It puts him or her at risk of incriminating himself, perjuring himself, and looking bad to the jurors. It is the Defendant's Constitutional Right not to testify and incriminate himself.
Also, if you are a Defendant, you never take a plea deal. It is the Defendant's Constitutional Right to have a trial. If you take a plea deal and plead guilty to a felony, you have to register as a felon, which puts the Defendant in all sorts of trouble legally if he or she breaks a rule that all felons must obey. Even if you get convicted, you can appeal. If you take a plea deal, you can never appeal as part of the agreement with the prosecutor.
Also, if you are a Defendant, you never take a plea deal. It is the Defendant's Constitutional Right to have a trial. If you take a plea deal and plead guilty to a felony, you have to register as a felon, which puts the Defendant in all sorts of trouble legally if he or she breaks a rule that all felons must obey. Even if you get convicted, you can appeal. If you take a plea deal, you can never appeal as part of the agreement with the prosecutor.