well, that is the same problem that people @ xda have:
"What is the best ROM?"
"What is the difference b/w CM and AOSPA?"
the answer that you'll get would be "Flash each one, try it out and see"
there's just too much differences to be listed out... I (along with other people) mention some names/features... either you google them, or post asking what they are
or you'll just get paragraphs of texts describing each feature and how it's useful.. then people get turned off reading a wall of text
That's kind of my point. This isn't XDA. This is a more general forum where people might be able to get more general info.