Question; if your troll friend needed some brain surgery, would you rather have it performed by a flying rotodrone or a tracked drone?
That flying drone would likely cut into some sensitive parts, because it cant keep as still as the tracked one.
Answer: its a trick question.. he is a troll, just whack him with a mallet and he is fine again.
But seriously now: remember the roto drone might have a lower handling, some things are easier for it to make than other vehicles, like the example on page 199. It says the treshhold for a vehicle driving through a space just large enough for it, then jumping and rotating in the air, knocking the attached bomb uderneath it off a crane and then continuing rotating and landing on its wheels are a treshold of 4+
But not for the roto drone, as it doesnt have the same difficulties in "jumping and rotating" as a wheeled vehicle, its treshold might only be 2 or 3