Both of those systems are good, but the Mongoose uses a 26mm motor which would be overkill for that pan car. Most of the other popular 18th scale systems use 20mm motors which would be perfect for your car.

I prefer sensorless designs, but some swear the sensored systems are much smoother on takeoff and low speed. In my opinion sensored systems have a similar feel to a brushed motor. But sensorless controllers have improved so much in the last few years I think the difference is negligible, plus there less sensitive electronics to possibly fail.

Tekin, Castle Creations, Reedy and others make good reliable systems. My personal favorite is EZRun systems for their low cost and high performance.