What is better: CSS hacks or browser detection?

Question

Commonly when I look around the Internet, I find that people are generally using CSS hacks to make their website look the same in all browsers. Personally, I have found this

Answer 1

hacks will always add to your work efforts and work efforts should be optimized

first you add the hacks and then start worrying about how they behave on different browsers and different machine.

instead you can rely on vendor specific css extensions http://reference.sitepoint.com/css/vendorspecific