other than ergonomics - no - but they are very personal - go slowly and expand slowly (with what you need, not just what you want) is the key to getting a playable and interesting modular

"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