I get better traction on fixed in the winter & with experienced legs you can experience greater traction control in slippery conditions. Winter is the only time I would prefer a fixed over any other bike for practical or performance reasons. The drive train can't be stopped by ice build up, whereas a freewheel can freeze & gets chewed inside by salt grit & a derailleur can get shot to hell & back by ice in no time. Pissing on your derailleur to get moving again to meet your deadlines is a stupid feeling.

Beyond that it's not a "vs" Silly question altogether.