Answer
The force exerted by the ground on you is much greater than the force exerted by the water on you.
Work Step by Step
In the water, it takes a lot more time to stop compared to the time it takes on the ground. If you drop the same distance in both cases, your speed when you reach the water is the same as the speed when you reach the ground. So, according to: $a=\frac{\Delta v}{\Delta t}$, the magnitude of the deceleration when you reach the ground is much greater than the deceleration when you reach the water. Finally, according to $F=ma$, where $m$ is your mass, the force exerted by the ground on you is much greater than the force exerted by the water on you.
