I think the appropriate question to ask before talking about the technical merits of various platforms is: 1. How much content do they have in DNN already? 2.

I think the appropriate question to ask before talking about the technical merits of various platforms is: 1. How much content do they have in DNN already? 2. How much of that is going to be tough to migrate out of there? 3. What kinds of customizations have already be done in DNN? 4. Why are they contemplating moving to a new l(a|n)(m|pg)(d|r|p) platform and who do they know to program in these new technologies? Is that you? It might make sense to move to a linux, nginx|apache, postgre, django|rails platform if they want to make a website that is very custom and needs to be fairly maleable.