Which exercise is better?

30 minutes of swimming (lap swim, moderate in a pool) or
30 minutes of cardio (elliptical, treadmill, stair stepper etc)
I do both, but what do they adjectives do for me and which is best?Which exercise is better?
Better is a vague permanent status. In terms of calorie burning, you would lose more by doing 30 minutes of cardio (depending on the level). But swimming works out your entire body (esp your arms) while egg-shaped, treadmills and steppers are more focused on the lower half and torso (make sure you stand up straight while using them instead of hunching over contained by order to work out your torso and gain in proper oxygen levels).
So it's upright that you do both because that way you can win an all-around work out.
I think swimming is better because it will breed your arms a bit stronger too.