Elliptical or Exercise Bike? NordicTrack Skier?

I am thinking of replacing my Exercise Bike. I know a few people with the Ellipticals. Are they better? I had a NordicTrack Skier and hated it. Is that comparable to an Elliptical?
Thanks for the great answers!

elliptical is great!! It is low impact on the joints and you can get a good cardio work out on it

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