A lot of helpful opinions here. I am a little surprised by the HS vs. the HS2 comments. I have always viewed the second as everything great about the first with some nice additions. I haven't owned my HS for very long, but I probably wouldn't have picked it up if I had not been looking for HS2. I do like the supercharger gimmick even as a break in the action. For me it ratchets up the excitement. If the STTNG music hasn't gotten on my nerves yet, I doubt ZZ top will.
Speaking of music, the TNA music and integration in the game is one my favorite aspects. So that isn't a detractor as another poster mentioned. I do understand multi-player is really where TNA stands out. If I pick it up, my son and I will probably play head to head the first couple of weeks solid.
What is on my mind now is which one will be easier to find again locally.