I'm confused, do you mean there is a new title coming out called "Gottlieb Vs Williams" and it is for the Wii? Or are you asking which is better: Gottlieb Collection for Wii as opposed to the Williams Collection for Wii (in which case Williams Collection is far and away the winner).
Personally I wish they would make a second Williams Collection for Wii with some of the sequels. For example the first collection had Pinbot and Black Knight, why not release a second game with Bride of Pinbot and BK 2000 on it? Oooo and while I'm making my requests, throwing Roller Games on the new collection would also seriously rock.