Quoted from kesselrig:Can anyone who has played both this and X-men comment on how similar they might be. Wondering if the three flipper fan layout might be too close for a two machine collection.
In a way it's like being concerned with the standard two flipper/2 sling layout at the bottom in multiple games along with two orbit shots... it's just accepted that every game has those today, even though there was substantial variation in those areas in the past.
To answer your question more directly, I have them sitting side by side and they don't strike me as similar in shots or rules. The third flipper shot is similar but unlike SM there are other shot options available for that third flipper. ST also has the same third flipper, so does Tron (mirrored), but no one seems concerned about the similarities with those games either.