Kevin Love is one of the worst defensive PFs in basketball, for two reasons. One, when he is defending the post, he doesn't jump to contest the shot, because in doing so he'd be out of position for a potential rebound, when most of the time there isnt one because he didnt defend the shot in the first place. Second, he plays half hearted help defence, again preferring to crash the boards instead of making the correct rotation, and it's not for a lack of foot speed and athleticism, as he does pretty well for himself on offence.
Until he plays winning basketball on defence, LaMarcus is a better player. LaMarcus has taken a huge step forward this year in becoming PORs true franchise player. He's been fantastic this year, and has had more of an impact on winning this year than Love has.
I'll take LaMarcus over KLove too, something I've maintained the past few years as well. Its nice to finally see POR surround LaMarcus with a good all around team where he can shine in the spotlight.