Quoted from Zablon:
i think the key here is 'depth' and 'children' don't go together these days. Many simply don't want to invest the time in a challenge. I see a lot talking about how deep WoZ is, and frankly, that will be a turn off for most kids.
If it's for you and you are a pinhead, then maybe WoZ is better, but if it is for 'non-pin' family and friends, MB is the way to go - but I agree with some others, just buy both and sell the one that doesn't get played.
Depends on if you think kids will really keep playing. I've seen advice on forums that usually steers people away from getting a game they think/hope the family will play. Many times, family doesn't, so get game more for you (WOZ), and hope family plays.
I'm lucky, my wife plays pinball with me & likes it. Older kids also sometimes play, but not as much.