The pseudo-palates used with the Kay Elemetrics and Reading EPG systems mainly differ according to their number of electrodes, 96 vs. 62 respectively, and the spatial repartition of the electrodes over the palate. The two pseudo-palates also greatly differ in their price according to their number of electrodes. This study compares how variations in linguopalatal contact are reflected by the two pseudo-palates and evaluates the contribution of the extra 34 electrodes of the Kay system in terms of description of segments articulation, discrimination between articulatory patterns, and replication of attested coarticulatory effects. Results show that the Kay system reflects with greater precision the actual contact of the tongue against the palate and subtle articulatory variations. It provides additional information mostly in the palatal, velar and dental regions. However, with 62 electrodes, the Reading pseudo-palate is still able to reflect the articulatory variations studied and to discriminate articulatory patterns. Implications of these results for improving the resolution of the Reading pseudo-palate are discussed.