Both are great games, play both and get which suits you best.
I have played both and to me the extra money for the physical ball lock for Godzilla multiball, Mega Godzilla ball grab and the collapsing tower when dropped one level is a ball diverter again reversing ramps was worth it for me. However I did pay MSRP and not over inflated prices.
I could do without the collapsing bridge IMHO