I use Stubbs for competition cooking. I have never used Kingsford Competition because its darn expensive and hard to find around here. I find blue bag is fine for the backyard and Stubbs is my charcoal of choice for competition. Though, I honestly don't think I can taste the difference.
2013 Stumps Classic - Delivered 4/15/13
Large BGE - Rescued 2012
2010 WSM 22.5"
2010 Weber genesis gas grill
Rescued 22.5 Weber One-touch gold
BBQ Guru CyberQ
2011 Built UDS - Retired