Quoted from RTS:I have both of these games. They are extremely different. SM is exhausting when I play it and I don't always feel like putting in the time. Ball times are generally longer, and it takes forever to build up a score I care about. I can have a long game with a great score, but often I don't feel like I had to do anything other than constantly bang away during multiballs.
STTNG will give me shorter ball times more often than SM. But when I have a great ball, STTNG feels more rewarding and exciting.
That's the key right there.
Do you want a pin where the games you are playing are really, really long, or one with much shorter games? Personally, I like them both, but I prefer shorter games, so STTNG gets my vote.