MET and TWD are excellent Pros (I own them both), and you won't be disappointed with either. I give TWD a bit of an edge because I like the whole package a bit more (layout, rules, strategy, sounds, looks, and overall awesomeness). TWD is punishing an may wind up frustrating you and your whole family. MET has the Sparky multiball which players of all levels can achieve. MET also has a great ruleset and the Crank It Ups are awesome.
Good luck in your decision