I definitely like the Thunderhawk more!
When Hercules was new, it was a decent ride... not great, but not bad. It had an interesting lift hill approach and a great first drop, but the ride was pretty mediocre after that, with no major drops or airtime. When I rode a few years ago, it was so rough and painful that I am contemplating whether or not I will even ride it this weekend.
Aside from doing something to make the coaster smoother (re-tracking, new trains?), the ride could have greatly benefitted from another major drop or two down the hillside, and maybe some speed hills towards the end of the ride. There was nothing tragically wrong with the basic design, it just seemed like the ride was anti-climatic, it gave its best in the beginning and lost intensity near the end.