I would go for the Quantum of those. But you may even look elsewhere. Those are both pretty stiff and poppy jump boards made for bigger jumps. You probably wont use all of the board for another 2-3 years if you're just starting park.
Better places to look would be a 152 Ride Kink, 152 K2 Weapon, 152 Nitro Swindle, 150 Signal Omni, or a 152 Flow Verve. All are fairly inexpensive but well liked park boards. They are all softer meaning it will be easier to pop them and will be just fine on jumps under 30 feet. They are going to be far more forgiving than a Quantum or YB and will make learning park easier and more fun.
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