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I wouldn't want to give a grading until I see them a few more times (and I missed most of Fister's start), but at first look both have average to slightly below average heaters.
Fister's fastball movement into righties is probably what gave him such extreme HR LH/RH splits in AAA, but the lack of downward movement and velocity downgrade it. French has better life on the heater and throws lefty which gives him an edge, although the heater is def straight.
Perhaps the horizontal movement puts Fister around 45-50 and French around 45, but its a pretty negligible differenece. Dead-armed French definetly has a poor fastball, the fresh one's is pretty averagish.