Well I have both sensored and sensorless setups (mamba max/fiegao 9l and novak hv4.5) and there is a difference, not just at startup. There is a certain random abruptness I dont like when varying the throttle at 5-20 mph on a sensorless system. For this reason, it doesnt hurt to put some sensorwires in. And it could be both sensored and sensorless simultaneously, which would be ideal.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy