Agent-based modelling seems to be an alternative way of modelling to System Dynamics. Criteria for discriminating the methodologies, and criteria for the choice of which one to use, still remain vague. This study compares both approaches on an empirical basis, utilizing an exploratory experiment aimed at investigating the respective comprehensibility of each methodology. The gained results, considering all the observations, show no significant differences between the two treatments. Nevertheless if the subjects are grouped into SD students and non-SD students, differences are observed. Interestingly it shows an advantage of the AB approach for the SD student group, whereas the non-SD students seem to have an advantage with the SD methodology.