Metallica is great but gets stale after a somewhat long time of playing it and becomes more work than anything.
TWD is Lyman (and sterns) best coded game ever. The layout is tough and unique which gives it a much better last ability in a home enironment over the simple fan layout of Metallica.
Both are great, but TWD gets my vote and it's not even close. So much more to do with a wide range of breadth and depth.