I just caught another oddity in the rules. So, on page 238 the rules say that when you are controlling a device, "The dice pool of any test you make using this action uses the rating of the appropriate skill and attribute you would use if you were performing the action normally." Furthermore, "All actions you take while controlling a device use either the normal limit for that action or your Data Processing rating, whichever is lower." In this case, when using drone stealth, it seems to me that handling would replace physical as the "normal limit." So, according to those rules drone stealth should use Stealth + Agility [Handling or Data processing, whichever is lower].
Now, the rules for staying hidden from sensors are different. On page 184 it says, "If the target is trying to evade detection, make this an Opposed Test versus the target’s...Infiltration (Vehicle) + Reaction [Handling] (driven vehicles)." Well, the term "infiltration" is obviously a typo. That should read "stealth." And, what (Vehicle) means is explain after: "Since vehicle stealth is limited by the driver’s ability, the dice applied for Infiltration skill should not exceed the driver’s appropriate Vehicle skill." Fair enough. Avoiding "radar" (and other types of sensors) is not the same thing as avoiding visible detection (even though metacritters do just roll a usual stealth check, oddly enough). So, when trying to avoid being spotted by a living creature you roll one thing. When trying to evade sensor detection, you roll another. Makes sense. This is why there are two different pilot programs for stealth (stealth and evasion).
On page 270, however, things get weird. The game tells us that, for drone infiltration, "When jumped in, the test is Stealth + Intuition [Handling]." Huh? Why Intuition? That doesn't jive with the "control device" rules at all. How do the control device rules interact with this? Does someone use a different dice pool to control a drone based on whether they are hacking it or controlling it legitimately? That doesn't make sense. Is the rule on 270 an exception to the norm that applies to drone infiltration? And, if so, why does drone infiltration use Intuition instead of Agility?