hehe another dual-sport thread
here's what it comes down to (sorta).
KLR650 has longer range (6 gal tank i think), better (stock) road tires/capabilities, and some crazy aftermarket support, and is a better commuter than the XR650L.
The XR650L is better offroad (stock for stock) due to it's lighter weight, and knobbier tires, which also make it less capable pavement bandit. Not to mention it's meesly 2.8 (or is it 2.6?) gallon tank.
Though tires and gas tanks can be changed or swapped out to fit your needs, so go with what ever one feels better to you. I myself am a 650L fan, and if i were to get a dually, that's what I'd get, along with an IMS 4 gal tank.