It all depends on what type of game play you like. I am not a very good player, I can usually get Grand Champ on my pins but that is about it.
FT is a fast game with short game times, 10-15 minutes if I am playing really well. My personal favorite machine of all time.
DH is a good game with modes and objectives. The only problem with DH is that I found it too easy. Game times would last me 30 plus minutes, 9 games out of 10.
DH is not a dog by any means though. Just not a popular theme.