For the sake of opinion/answer, iFit. Why? Because I use it. Hah..! Also, it's smaller and I don't need a Freak barrel to use the inserts. I can use whatever barrel I want (as long as it works for the adapter, obviously).
You'll be fine with either one. People that use a Freak will say it's fantastic for them and that's the way to go. One of those things really..