Intramuscular Injection Sites?

We are having a bit of a debate at the school of nursing where I teach. We are having difficulty getting the students to properly landmark. Although a majority of the texts state that ventrogluteal is the preferred site, but we are wondering if you are using ventrogluteal exclusively in the clinical areas or is dorsogluteal an acceptable alternative. We as the instructors feel that dorsogluteal is a good site for new practitioner students who are nervous enough about an IM and need a littel larger "target" for their injections. Are we wrong? Is this a big no-no in the clinical area?
We would greatly appreciate any feedback, advise or literature/text resources to support one way or another.
Thank you!