Tech a says that the weight of the flywheel smoothest out the engines power pulses. Tech B says that the flexplate and torque converter perform this same function. Who is correct?

both statement is correct

Explanation:

Flywheel engine uses to reduce fluctuations.

And

FlexPlate is a metal disk that connects the output from the engine to the input of the torque converter. This will replace the flywheel

so that both statement is correct