I have converted to stubbs and lump only. I also get better burn time out of stubbs. I used Kingsford for about 6 to 8 years so I can compare from experience. So for what it's worth IMHO no you don't get any longer burn from Kingsford.
22.5" Weber OTS, UDS, 30" Kingsford grill, ECB, Maverick et732.