Futaba says Brushless are 5x longer lasting than brushed servos and respond 30% faster(faster than what it doesn't say), all with same power consumption... I don't think I've ever had a servo go because the motor brushes failed, so 5x longer lasting means nothing to me. 30% faster response time is probably dependant on receiver resolution, battery/BEC voltage, and application. So I still stand by what I said before... Brushless is Good for heli's and other high-demand/constant imput applications. For Cars and Trucks I'd put emphasis on torque, speed, durability of gear-train, and dust/water resistance like you said... No advantage to brushless in surface applications IMO