Brushless is superior to brushed, but brushed motors are more than adequate for this car, and cost less. It's difficult to find brushless motors that are "slow" enough for this truck. Most are too powerful to give reliable performance with the printed gear train. A 1000 to 1200 kv brushless motor would work well, if you can find one. Outrunners will work as long as they are the right diameter and have the right shaft size.
I still recommend the 35T motor in the parts list on the detail page.