I have a 4 year old and one thing I was considering in the same decision was that he's more likely to identify with the SM theme than Ghostbusters. Obviously game play doesnt even compute here, so it's really all about theme for him. He's still too young to watch the GB movies, but loves superheroes. I figured as he got older and got into GB, I can move onto that game then - if I haven't already bought it.