My Pops has both so I played them both for a while then I went with a nib Luci 100%. Met is nice but the speed compared to AcDc is painfully slow (especially on Met left loop). Also not a Met fan so music doesn't do it for me even when hooked up to a sub. Great great artwork on Metallica. Would still own one. If I had to have only one it would definitely be AcDc!