Both are still being tweaked so they are not guaranteed to work yet. Ivan has since slapped it together and finished it up. Fill out all options under each of the sections and after you finish them you should have a functioning IMP installation. Well, at least the major aspects. As time progresses, this method will become the main method for configuring IMP and will handle everything for you.
Packages are by far the easiest way to install any program.
The reason I say this is because most of the work is done for you. Currently there are 2 types of packaging out there in use. This package takes care of most configuration issues and still allows you to customize your IMP installation. After installing this package you will have a functional IMP installation. If you would like maintain one, please get in touch with use.