"is there a general and fundamental difference between the two RV lifestyles?"
I'd say "yup there is". One of these groups drives their "home away from home", while the other group pulls their "home away from home". Other than that I don't think it would be easy or fair to make blanket generalizations or assumptions about either of these groups. MH people don't necessarily spend more on their rigs than the AS crowd and vice-a-versa. I'd be that there are nice folks and jerks in either camp.
But what do I know? I've only used KOAs from a tent and sleeping bag perspective, never with a solid roof over my head.
"Like a roller in the ocean, life is motion, move on...
Like a wind that's always blowin' life is flowin' move on...
Like the sunrise in the mornin' life is dawnin' move on...
How I treasure every minute, being part of, being in it, with the urge to move on"