This work falls within industrial maintenance decision-making process. In this context, the identification of the most critical equipment is usually handled in maintenance studies using classical risk assessment methods such as criticality matrix and Pareto diagram. Knowing that criticality depends on many factors, the framework of Multi-Criteria Decision Making (MCDM) techniques is well suited for the prioritization of critical equipment. In this article, we propose a classification of industrial equipment following a comparative approach between PROMETHEE (Preference Ranking Organization METHod for Enrichment Evaluation), TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution) and the criticality matrix method. The prioritization of the 12 pieces of equipment considered, in the studied gas complex, is carried out according to fundamental and essential criteria in maintenance which are reliability, productivity and costs. In order to ensure the consistency of the judgments, the evaluation of the behavior of each piece of equipment in relation to these 3 criteria was carried out using industrial history data.