I have to say having worked with Sims for the past 10 years I was introduced to Progresso on a training course and was distinctly unimpressed.
Progresso seemed to still be in the development phase. Too many bugs and the user interface uninspiring.
In short go for Sims. It is an established MIS and you will be able to find support on line via forums more readily available than if you were to go the progresso route.
I'm not biased as I also support Pearson E1 but think given the choice, SIMS everytime :-)
