© 2021 CERN. All rights reserved.We perform an analysis of the predictions of several supersymmetric Grand Unified Theories (GUTs) for Dark Matter and the LHC and compare the results with a possible Lepton Flavour Violating (LFV) signal, when the models are extended with a see-saw mechanism to explain neutrino data. We study unified theories based on SU(5), flipped SU(5) and SU(4)cSU(2)LSU(2)R, enhanced with a Type-1 see-saw mechanism. Each GUT predicts different Dark Matter (DM) scenarios, which can be used to classify the resulting SUSY predictions and confront them with experimental searches. Our results indicate that LFV is a powerful tool that complements LHC and DM searches, providing significant insight into the sparticle spectra and neutrino mass parameters in different models.