The Freak and the Sonata don't have any competitors. They are both unique. And both so Ulysse Nardin.
The Sonata is more " friendly " than the Freak with its 24 hours alarm sounding like a minute repeater, its GMT you can set forward and backward and the date you can set forward and backward, too.
The Freak is more an UFO, which will give you the Time, only, and which looks like no other watch. It is more " conceptual " than the Sonata.
The good news is that you can't go wrong with any of them.
Let's say that if you travel, then the Sonata is more for you.
Aaah, another point: The first generations of Freak were not water resistant. Which may be a problem. Not for me, personally. And the Freak cannot be seen as a daily wearer.
Best,
Nicolas