That depends on your own personal tastes and what your looking for. First off, you have to know that neither the Hot Wheels or the MM have an engine in them, they are both curbside models. All they have is an insert under the opening rear glass. On the Hot Wheels, the doors and the rear glass open. On the MM, the front compartment, doors, back glass and rear compartment all open. I like the wheels and brakes on the Hot Wheels version better and the Hot Wheels has better paint. Beyond those differences, they are about the same. . .
MM Version: (custom paint)