Right now HS2 sits at #26 on the top 100, and HS sits at 72. Based on that, I would think the voting here would be about 2 in favor of HS2.
I had both sitting side by side for a while. HS ended up leaving. In fact, it was the only game I've gotten rid of so far. It was a good game, but I really like the deeper rules of the DMD, and I also love the shifter. It feels good to reach down and grab a gear while playing, as you have to do it when your ball is in a relatively safe place on the playfield. The shifter is pretty unique among pins. The Super Charger is also cool, and it's fun to try to park 2 or 3 balls in it during multiball. If you can get 3 balls in it, it can shake the cabinet pretty good which is cool.
HS does have the cool road sign spinners, and the ramp going to "hideout" is cool, and makes total sense themewise (as in get away from the cops by going to the hideout). I wish HS2 had those cool spinners!
Either way you go, both are great games.
Jeff R.