Show off? If you insist!
My dad's got a 2010 LMM, and I the LML. Both great trucks. My truck gets slightly better MPGs, rides better and is quieter (not necessarily a plus?). You can't go wrong with either, but I think if you don't buy the LML, you're going to wish you had.
Present: 2015 K2500HD LTZ Crew Cab Z-71
My Chevy Truck History:
2011 K2500HD LTZ Crew Cab LML
2007 Classic K2500HD LT3 Crew Cab LBZ
2006 K2500HD LT3 Extended Cab LBZ
2003 K1500 LTZ X-Cab Z-71 5.3 Liter Gas
1998 K1500 Silverado Z-71 5.7 Liter Gas