I have both and love them both. They are so vastly different but fun pins. I picked up my IJ back in 2002 and STTNG around 5 years ago.
I gave IJ the nod as it is so much more brutal to me as it is set up. I do need to get my mode start to catch the ball more effectively (probably catches 1 out of every 5 shots). After I resolve this I'll reevaluate my opinion of IJ vs. STTNG.
~Steveo