I'm just going to agree with what glitch_oz is saying because it's exactly right. If you do a lot of motorway (freeway) riding get the DL, but if you like the backroads and gravel trails go for the DR.
I've owned four DR650's now so I'm a bit biased but for me it's the best go anwhere dual-sport bike there is .
1996 UK model behind modded for overland riding and 2012 Standard model in front , that one is from Perth originally and still has some Aussie red dust on it