nerd voice: If my calculations are correct *pushes up glasses*
If we're looking at the Comic/Mandolorain S2 version of Luke, he'd easily smoke Voldemort; better than what Harry did. Heck, he took down an entire legion of Dark Troopers as if they were paper.
BUT, if we're looking at the prequel trilogy of Luke Skywalker, then his lazy-@ss bum would stand no chance against Voldemort. He died from using a force ghost lmfao