We are on our 2nd stove-top popper. I love, love, love it! We use margarine to pop ours, 1/2 cup WHITE popcorn to about 2 TB margarine. Then we use a little salt, it's Yum!!
I wanted an air popper too, but someone suggested this. I was REALLY hesitant, but did. I'm so glad, not because it's necessarily better, but I hate having to plug in the air popper, and having more small appliances in the kitchen.
Another benefit to the stove-top, is that you can do a variety of recipes. You can do spiced popcorn, kettle corn, buttered corn, oil, etc. It comes with a recipe book, and you can definitely lower the amounts in the recipe if it's too sugary, oily, etc. I also only buy white popcorn, the yellow is too cardboard-y for me. I get it in bulk at a local amish grocery. Our popper is a "Whirley-Pop".
Calorie wise, air popper takes top prize.