Confectioners sugar is just sugar grounded into a finer powder. It dissolves faster but doesn't render a different or better taste. I am a bit of a lemonade snub but am happy with the Chik-Fil-A product as it meets all my criteria.
1. Made fresh daily.
2. Juice from hand squeezed lemons.
3. Sweetened with real cane sugar.
Seriously, have you ever tried it?