My limited understanding is that omnimic and room analyzer are
1. Complete packages - software, mic, soundcard/computer interface.
2. Much closer to plug and play
So for those who don't want to purchase and setup the individual components they are the the simplest solutions.
Myself, I have mics & a sound card and I've downloaded REW and played around with it just a bit. It's not exactly plug and play but I haven't given it a fair chance yet. And unfortunately there always seems to be something else I need to do before I get to sitting down with it again. So for now thriftiness is winning out over laziness, but that has a tendency to change with me...
