The science payload that an aircraft can carry is much smaller compared to a rover. Also due mass restrictions (afaik) copters are solar-powered, while rovers c

The science payload that an aircraft can carry is much smaller compared to a rover. Also due mass restrictions (afaik) copters are solar-powered, while rovers can be rtg powered; this is pretty relevant for cave exploration as it would be pretty catastrophic for a copter to run out of power in a cave where as rover could at least hypothetically find its way back out.