treadmill or bike, which is better...?

[ACpower]

i personally like the eliptical

[StoneGRMI]

i personally like the eliptical

Me too. From a scientific standpoint it makes sense that if you have your heart rate at the target rate it shouldn't matter what cardio activity you're doing BUT from a personal standpoint I always sweat more and feel like I'm getting a better workout while on the treadmill or elliptical even though my heart rate is the same...weird, I know. So, do whatever keeps your heart rate up and satisfys you! Switch it up here and there so you don't get bored.