Here's why:

* Polarity: Oxygen is more electronegative than hydrogen, making the O-H bond in water polar. This polarity allows water molecules to interact more strongly with the slightly polar oxygen molecule through dipole-dipole interactions.

* Hydrogen Bonding: Oxygen can participate in hydrogen bonding with water molecules, further enhancing its solubility. Hydrogen, being nonpolar, cannot form hydrogen bonds with water.

* Solubility Data: At standard atmospheric pressure and 20°C, the solubility of oxygen in water is approximately 0.043 g/L, while the solubility of hydrogen is only about 0.018 g/L.

Therefore, oxygen is more soluble in water than hydrogen.