have you read the module descriptions on here?
what is your understanding of what they can or cannot do?
I just took a quick look at the module descriptions and they seem fairly understandable...
to me the main differences appear to be:
one has more cross-fading channels and one has panning and an aux stereo input
one is 12hp one is 10hp
one draws considerably more power than the other
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities