Winterization Air vs Chemicals...... Your 2 cents please

We use AF. It's piece of mind and cheap. We camp into the frosty months here in East Tennessee so I might winterize, de-winterize and re-winterize 3, 4, maybe 5 times toward the end of the season. I can blow the lines out and pump AF in 10 minutes. Too easy. I keep a gallon milk jug of water with a little bleach in it and pump it through the lines before we leave and the lines are clean and smell nice and fresh when we get to the campground.