Totally different classes.
A pan car is 2wd, flat "pan" chassis with the motor and axle in a pod for rear suspension, direct drive from the motor pinion to the axle spur gear.
A touring car is all wheel drive via either belt or shaft from a common spur gear to the front and rear differentials.
TC's are more complex, weigh more and can be a bit cramped to work on.
Pan cars are simpler designs, but can be just as difficult to set up, they're faster than a TC with the same motor, but that can lead to more parts breakage.
I would look at which class has the most entries at your local track and buy a car to compete in that class. More entries means there should be more chance of running with some guys the same relative speed as you, whether it's with the fast guys, or further down the order. It's all about fun, and it's always more fun running with guys you actually have to race with rather than one of you moving over for the faster one all the time.