What is the test for appointing a new counsel for a convicted criminal?

Defendant asked the trial court to appoint new counsel for him because he did not feel there was any "trust" between him and his present counsel. (People v. Marsden (1970) 2 Cal.3d 118.) He complained his counsel recommended he take a six-year offer because the court would sentence him to 14 years, and that he would be "crazy" to make a counteroffer. Defendant also claimed his counsel was ineffective for failing to file a Romero² motion to strike the prior strike conviction, and she "belittle[d]" him.