Earlier quoted context omitted.
I will take butter every time over margarine and other spreads. Simply on the grounds of how they are made. One is a food, the others entirely chemical processes. Nearly all the butter is bad is funded by the spread industry.
Margarine's production is more complex but it doesn't seem too wild: http://www.madehow.com/Volume-2/Butter-and-Margarine.html Either way the milk is coming from a cow pumped full of hormones and antibiotics.
Fairly recently UK was prosecuted for not checking antibiotic levels adequately.