Game designers build the premium models first. Mechs/gimmicks are taken away to lower the price and become the pro model. Artwork, limited numbers, and things like signatures are added to make the LEs.
Ultimately, it is up to the buyer for where the best values are. Pros tend to play faster because there are simply fewer "toys," but some people really like the added items.
Personally, I tend to favor the premium for most, the Pro for some, and the LE for only a few. In this case, I would likely go for the pro and put the extra towards my next game.