In Spain, dual vocational training has recently become a fundamental pillar to train the working population. This article focuses on two objectives: to evaluate the quality of two models of dual VET in Spain and to identify their differences in terms of the following dimensions: Teaching Team, Process, Evaluation and Synergies. To achieve these objectives, a quantitative methodology and a cross-sectional design were used to collect data using an ad hoc questionnaire (37 items) developed based on a literature review and the 14 European quality criteria. The sample consisted of 263 educational institutions. Regarding the results for the first objective, Model B implemented EQAVET with higher quality. With regards to the second, researchers observed that all dimensions received a high or very high compliance of 70%. However, discrepancies were primarily found in the training of tutors in training centres, quality certification of dual VET and links, and support and cooperation between training centres and companies. This study provides empirical evidence regarding the factors that lead to higher quality dual VET in schools, based on the manner in which the criteria of the European Framework for Quality and Effective Vocational Education and Training (EQAVET) are implemented.