>>76235186 (OP)Sprinting uphill is far more intense.
The most intense way to do cardio regardless of the exercise (skipping rope, jogging, sprinting, cycling, battle ropes, etc) is to do intervals of moderate intensity to max effort intervals and repeat for time.
For a example jog for 1 minute at a moderate pace and sprint for 20-30 seconds, then go back to a jogging pace, repeat this interval 4-5 times and you'll get better cardio than jogging at a steady pace for 30-40 minutes.
You can do this with any cardio exercises of your choice and i guarantee that everything else will be easy afterwards.