I have both as well. Bought the Specialized first and the Sidi's second. They are very different, the specialized seem to have more room in them. The clips are also placed diffrenently on both shoes. The Sidi's have the clips more up front. (if that makes any sense).

Do take the time to try them both on. You want to make sure they are a good fit.

I love my Sidi's and would definately buy another a pair.

Good Luck! Would love to know which pair you end up with.