practical:

fixed:
-its harder to give up spinning like a madman in a paceline, the fixed doesn't let you suddenly pause and when you stop at 140rpm its harder to quickly get it going again, so you may get gapped

freewheel:
-you can go faster down long steep hills with the same gearing that lets you get up the same hill
-you can corner at higher speed given the same cornering skill and same bike geometry