The Yamaha Oaks are unique, original, and sound great.
The Mapex are...
Mapex. Neither good nor bad...they just are. Vanilla.
Oak, because it is very hard and stiff, is 'technically' brighter and louder than other woods, including maple but...
don't pay much attention to the pseudo-scientific drivel propagated by manufacturers. We're talking about drums here, not violins. The differences are extremely subtle, and while a more experienced and discerning drummer may be able to sense the feel and response of different wood types, it's nothing that will ever cut through the mix. Even under a mic, where the differences will be more apparent, once the other instruments are up and running, no one will ever hear a difference. A well tuned drum is a well tuned drum. Regarding the volume of Oaks, again...insignificant. The Oaks do have a slightly brighter character, but nothing to get in the way. You'll notice far more variation in tone and volume just by moving your drums from room to room, or switching heads...sticks...mics.