If the “jammer” simply deprived the drone of all GPS, yeah it might be programmed to land directly and more or less gently.
If the “jammer” instead spoofed the drone with valid-seeming GPS signals indicating it was climbing rapidly, it might well respond by diving rapidly to maintain what it mistakenly thinks is constant altitude.
Or if the “jammer” is really a take-over-the-controls transmitter, and issues a “descend rapidly” command
If we’re talking about an advanced adversary hacking the drone, that’s a risk for the $20,000 one, too. All drones have a computer on them, and the marginal cost for good encrypted communications software is zero, so there’s no reason to expect that the expensive drone is any less hackable than the cheap one. And in fact the swarm can be made more secure against hacking, just by getting your drones from multiple different suppliers. The swarm is also more robust against, for instance, gunshot: It’s not hard for a single hit to take out either the cheap or the expensive drone, but with the swarm, the hit only costs you a 1/n share of your dronage.
Cost is a good reason to expect that the $20k drone may be more secure from jamming. Anti-jam is mostly a hardware solution which may be cost prohibitive (at least the chips I’ve had some association with would be) for a $200 drone but feasible for a $20k drone.
As others have already stated, the $20,000 drone has higher & greater capabilities than a cheaper one. Look at my post #6, above for some of the features of the expensive drone.
Drones can be pre-programmed to follow an uploaded course, land surveys, power line inspections, etc.; however, I’d think most of what first responders want them for would not be able to be preprogrammed due to the dynamic nature of their situations; therefore, you’d need a (trained) operator flying each drone. Even crowd surveillance, you’d want to stop & go back, or view from a different angle anything suspicious that you see on someone in the crowd so just flying a pattern over a park isn’t good enough for them. Same with search & rescue (SAR) - is that item something of interest or just a random piece of whatever in the field/trees? By positioning the drone differently, the operator may very well be able to determine that it’s not who they’re looking for because it’s not a person.