I've been asked many times about the differences are between Revit Architecture, Revit Structure and Revit MEP? Are they the same with different tool sets? Is Structure the same as Arch with expanded tool set? Is MEP Arch with an expanded tool set? Can I get all 3 in one?
Well, you can't get all 3 in one (man, I sure hope Autodesk can do something about this!!). As for the other questions about the differences between the 3 apps, there are a few things that are different. One of those is being the families that come with each product. I hope to soon look at the main differences and will post and update when I do.
Another is the External Tools that are available to each product. For example, Arch and MEP will not allow you to tie your model to a Structural Analysis program like Structure can. MEP, will allow you to tie into Trane Trace, but Arch and Structural cannot. Just take a look at the Extensions provided by Autodesk...there is a separate set for each program.
The next and maybe the most asked is the actual tools that are in each program. Well, there are many commands that are available in all 3, some in 2, some in just one. I've put together a document that lists out the command tools between the 3 products. I did not list every single command tool, just the ones that are not available in all 3 via the pull-down menus. You can download the document HERE.