Which is faster? - modifying css property or adding class in jquery

Question

I have about 100 elements in like and am trying to create an animation with jquery.

I need to a

Answer 1

According to jsPerf, addClass is noticeably faster by about 50%.

Here's the jsPerf data for Chrome but in my tests it was about the same using Firefox:

$('#a1').css({ 'background-color': '#000' }) 82,043 ±0.21% 48% slower

$('#a1').addClass("style1") 158,876 ±0.83% fastest