The Sym is quite happy off road where the Piaggio is a pig off road.
If you want something for off-road, then don't buy a scooter.
But Baron I'm intrigued where you got your off-road experience on an X7 to know how it handles in that environment. And what you actually mean when you say off-road.
I've never ridden a scooter off-road, and as I suspect with many scooter riders, never intend to, so not quite sure what the relevancy of their different handling characteristics in this environment adds to the discussion.
But the servicing/oil change frequency is, particularly with respect to maintaining your warranty.
Ace Scooters - practitioners to the scooter addicted. www.acescooters.com.au