Systems versus vendors
This was primarily a vendor list, not a list of packages. Oracle and Infor own many different ERP packages that were standalone and huge in their day. For example, Oracle and JD Edwards. They like to talk about about how they fusing those into one package but that still forces customers to do major upgrade, essentially they are implementing new packages.
ERP is much like what is happening in airline industry. All this consolidation is good for the vendors and not so good for customers. Higher maintenance fees and lack of ability to customize inhouse are the two major "gotchas" of today. Hits home for me, my career started in 1985 as an integrator of ERP, writing code to fill in gaps that all ERP systems have. In those days, that was license free code a company owned. Now, vendors love to package all database access thru a code based "adapter", which means anyone using your programs needs a client ERP license. Almost criminal but they got away with it.
As far as Saas based ERP, all about integration. If you are vanilla enough and have the network bandwidth and availibility (remember, your shopfloor may need to run without internet connection, not in your control), then SaaS could be good option. With maint fees, you are going to be paying "rent" on your licenses anyway. And as more and more vendors withhold source code, the only difference to SaaS is whether on premise is more available.