I have purchased this for Christmas. We went with the Xbox360 version over the Wii version because two players can play at the same time if you have multiple characters from the same world. The PS3 version also supports two player mode in the worlds.
We have some friends who have the game and they recommended that we get the starter pack and the companion figurines kit called the "sidekicks pack" which includes 3 figurines. This will allow for immediate two player mode for all three worlds in the starter pack.
If you aren't worried about two player mode, then you are good to go with the starter pack.
I think you can play two player on Wii U too but just not on Wii.
You may be right. We only have the Wii and not the Wii U so I didn't look into that system.
Most likely, there's not one for the Wii model that has been around since 2006, as that console is officially "on its' way out"...
So if I get it for the Wii, the only difference is they can't play multiplayer? For some reason, even though we have Xbox 360, my guys seen to prefer the Wii. I'm thinking the game is mostly for my youngest anyway, so the Wii might be okay? And if I do get it for the Wii, knowing they can't do multi player, is just the starter pack enough? Do they need anything else to get it up and running?