Out of the box, ERPs are much more powerful than software-as-a-service counterparts.  However, once an ERP is configured for the specific use of an organization it leaves competitors in its wake.  

However, configuration being a challenge; what we did, in our case and for our Contractor customers is focus exclusively on their needs and therein bring to them a contractor management software solution that fits well with construction and related trades contractor businesses.

PROs: ERPs can eliminate a lot of other SaaS applications

CONs: Resisted by employees that do not like change