There is always more potential for more speed with the smaller, lighter boat. V hull or flat bottom wont matter much, because only the back 1/3 or so if the hull is in the water at top speed. Acceleration from zero will be faster with a flat bottom.
The challenge with a boat a bit lighter than a motor is designed for is optimizing the motor to get all the potential top end speed out of it. You're more likely going to be having to adjust the trim and prop pitch "just right". And "just right" for one way of loading the boat is less likely to be "just right" for another loading of the boat.
I know the OP may not care, but since these threads have a lot of lurkers, for their benefit, I'll recommend the 15x52 with v-hull. You may lose a couple mph of top end speed, but you still have plenty of power and speed, and you'll also have less sensitivity to loading, prop pitch, and trim, and greater controllability and stability at speed. Asking the question suggests a certain lack of experience, and that lack of experience can cause problems when the power is mismatched to he hull.
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