Hi,
Surely if they are your customer they are looking to you to supply information on these topics. How can you advise on WM vs. EWM if you don't know yourself?
Everyone who has worked with WM or EWM will have differing opinions on whether it is good or bad, and it will almost always be dependant upon a combination of the customer's requirements and the capability of the implementing partner. With the right knowledge and experience, both WM and EWM can be made to work really, really well for customers. I'd want to know why your own consultants think WM is not very good - if that is the case why are you considering selling it to a customer?
This situation doesn't sound like it will end with a good outcome, given the information you have shared so far.
Cheers,
G.