Room acoustics design of various spaces of different forms and functions necessitates reliable tools of analysis. Computer-aided simulations have replaced physical models, since 1960s, in both research and mostly in practice, due to both time and cost efficiency. There are various room acoustics modeling approaches in sound field analysis. Different methods have different strength and weaknesses. This study aims to compare diffusion model (DEM) to ray-tracing, to investigate potentials or shortages of both techniques, and coherence to one another in quantification of basic acoustical parameters but as well in visualization of sound propagation in rooms. The research uses primitive geometric forms and their different combinations. Produced ten different geometric entities, which may well represent a real architectural space, are then utilized to produce room impulse responses in a ray-tracing simulation and as well by a diffusion equation model computation. Identical source-receiver configurations and material input are used for controlled experiments. T30 values and relative sound energy level differences are compared. Energy flow vectors are traced in time-dependent solutions of DEM, to check the characteristics of energy distribution within different geometric domains. Materials are varied over specific surfaces to check the effect of inhomogeneous absorption for investigated methods.