ONYX and scorpoion are just different fundamentally. Onyx is small moto parts as opposed to the scorpion which uses mountain bike suspension and brakes. The scorpion even has an actual full on mtb drivetrain with a derailleur and everything.
Riding an onyx feels like a motorcycle. It has conical headset bearings, beefy responsive forks and a real disk brake. My assumption is that riding the scorpion probably feels more like riding a nice older mountain bike.