[Disclaimer, I teach wingsuiting at Perris and LO there. We're pretty pro-squirrel around those parts, and I flew two prototypes of the ATC. Mine shows up later this week.]
If you're asking if you should buy a freak or an ATC, buy an ATC.
I get the appeal of flying freaks. I really do. It's a fucking incredible suit with an appalling amount of performance in a pretty manageable package.
The issue is that it's a lot of performance in a pretty easy to fly package.
I've seen a LOT of people upsize too quickly and end up either screaming through a group or have it step out on them and either have to panic pitch out of a spin or spun through like 5k of altitude. If your response to "How do you get out of a flatspin" is anything along the lines of cannonball / arch / close the wings, you're not ready for a freak.
Personally, I've found it way more fun to fly a Swift 2 with freaks and outdrive people who don't know how to fly a suit and instead are just relying on surface area.
With all that said, the ATC dives faster than a Freak, and flares nearly as well. Apply a little brakes and you'll be cruising with students without much work. I have no issues in an ATC flying with a Freak flock unless it's super slow, in which case I'll sink out.
But hey, i'm just a guy on the internet.