Collaboration is vital in product development, involving stakeholders from various disciplines, teams, locations, and management levels. Virtual reality (VR) systems can optimally support collaboration in various stages of the product development process, particularly for tasks like CAD review. VR goggles and multi-viewer powerwalls both enable collaborative CAD reviews, with multi-viewer powerwalls offering multiple 3D perspectives. However, both technologies have their advantages and disadvantages. A key distinction is that multi-viewer powerwalls allow people to see each other in reality, while VR goggles use virtual avatars lacking facial expressions and gestures, strongly limiting communication in co-located scenarios. This paper explores the suitability of VR goggles and multi-viewer powerwalls for collaborative CAD review, comparing their advantages and disadvantages through a qualitative user study. Results show that multi-viewer powerwalls, such as the CoLEDWall, significantly enhance communication and teamwork, fostering more intensive collaboration in the product development process, surpassing the currently predominant use of VR goggles.