MBSE (Model-Based System Engineering) is the formalised application of modeling to support system requirements, design, analysis, verification and validation activities beginning in the conceptual design phase and continuing throughout development and later life cycle phases. This paper is a practical approach of MBSE methods and tools comparison. It introduces a new COmparative FRAmework, named COFRA, that aims at putting MBSE methods and tools to test. The article proposes the evaluation of the ARCADIA method and its tool Capella and the evaluation of Nexter’s custom-made PROXIMITY method using Rhapsody tool. We have detailed the motivations for choosing these tools and methods as a stepping stone for MBSE tools benchmark. The article presents a few practical representations of an electrical UAV, which is an example of multi-physical system that suits our interrogations about methods and tool comparisons. Then, this paper concludes with our future works, with the need to anchor systems engineering with formal comparative analysis for MBSE, and how to tailor the methods and tools to the system purpose and category. This introduces the requirement of system-driven engineering, so that development costs and delays be formally related to business income.