The face of simulation-based training has greatly evolved, with the most recent tools giving the ability to create virtual environments that rival realism. At first glance, it might appear that what the training sector needs is the most realistic simulators possible, but traditional simulators are not necessarily the most efficient or practical training tools. With all that these new technologies have to offer; the challenge is to go back to the core of training needs and identify the right vector of sensory cues that will most effectively enable training mode in the human brain. Bigger and Pricier doesn't necessarily mean better. Simulation with cross-reality content (XR), which by definition encompasses virtual reality (VR), mixed reality (MR), and augmented reality (AR), is the most practical solution for deploying any kind of simulation-based training. The authors of this paper (a teacher and a technology expert) share their experiences and expose XR-specific best practices to maximize learning transfer. ABOUT THE AUTHORS Sebastien Loze : Starting his career in the modeling and simulation community more than 15 years ago, S{é}bastien has focused on learning about the latest simulation innovations and sharing information on how experts have solved their challenges. He worked on the COTS integration at CAE and the Presagis focusing on Simulation and Visualization products. More recently, Sebastien put together simulation and training teams and strategies for emerging companies like CM Labs and D-BOX. He is now the Simulations Industry Manager at Epic Games, focusing on helping companies develop real-time solutions for simulation-based training. Philippe Lepinard: Former military helicopter pilot and simulation officer, Philippe L{é}pinard is now an associate professor at the University of Paris-Est Cr{é}teil (UPEC). His research is focusing on playful learning and training through simulation. He is one of the founding members of the French simulation association.