As stated in the other posts, the Sunspree isn't a true "suite" hotel, but rather has a separate kids area built into the main room. It does not have all of the features of HIFS but we still thought it was nice.
I recently got an email about the Sunspree now having a free breakfast buffet, I believe that special ran until the end of September. They have also painted, instead of pink, the hotel now has a more modern multi-colored look.
There are a couple of things we liked better about the Sunspree. There were times that HIFS just felt too big, a walk from the buildings near the adult pool to the kids pool is pretty far and forces you to walk through the restaurant area with your swimming stuff. We also felt the Sunspree food court was less cramped, was better designed, and more efficient.
The Sunspree has similar activities, when we were there they had a movie theatre, karoake, pool activities, and a magic show.
The HIFS has many more features and is newer, but as stated earlier is also more expensive, especially with some of the current specials at the Sunspree. If they were the same cost I would stay at HIFS without a doubt. When putting cost into the equation you need to decide what you can afford.