I use canola oil or olive oil sparingly for frying and butter for other stuff. I've never bought margarine.

I'm surprised how many here said olive oil or canola oil. I took a nutrition class in college and those were the two best oils for high mono-saturated fats (the good fats). They're associated with the Mediterranean diet, which is heavy on fruits and vegetables & light on meat. There is a low incidence of heart trouble in southern Europe which is attributed to the diet. This isn't to say that you should drink olive oil. I just use is sparingly in place of corn or vegetable oil.

depends on what I am making - butter, olive oil, vegetable oil, crisco, lard, coconut oil

certain things I make call for butter and oil

If I am frying food I use Olive or Canola oil. If I am baking I always use real butter. I also use real butter on bread and vegetables. You will not find margarine in my family's house.

I mostly saute things in olive oil. Sometimes canola oil for deep frying if I don't want whatever I am frying to have the taste of olive oil.

For baking I always use real butter; never margarine. I don't think trans fats are better for you than cholesterol; and everything in moderation, I say.

I usually use vegetable oil for the few things I need it for. I don't fry anything, so I don't use much oil at all.