I would take the Challenger.

If you are really concerned about theft I would double up the theft protection.

The way people steal those cars is to break in, connect to the computer and create a new key. Sadly it seems to be easy to take out the side window on them even when rolled up.

Put kill switch in the car that will shut off the PCM, fuel pump or ignition. If they get in and clone the key it still won't run. A loud alarm if the door is opened and a flashing blue light on the dash helps too.

Thieves are lazy and will avoid cars that give them too many problems. If it won't start after the key is copied, if they can't access the computer to copy the key or anything looks like it isn't going to be easy then they are less likely to bother.

Around here they pull up to you at the gas pump and pull a gun to steal it when you go to get back in the car after pumping gas.

Only go to well lit busy gas stations if you have a choice.

Most importantly. Have fun.