This, Helix or Flash though?
Obviously a hard choice!
Helix has this very unique layout and landscape. It also provides great floater moments during some of the inversions and a decent amount of airtime. The turns aren't that snappy except for the one before the (duh.) helix. Very varied and fun experience but not the most intense and it has perhaps a little too many rolls. It's the only one of the three I've ridden and ranks #5 in my list.
Flash has a nice twisty drop, slightly bigger airtime hills, a cool Zero G Roll and some twisty bits at the end. The trims before every single hill but one are heartbreaking though...
DC Rivals has an arguably even better drop, EGF style. It seems to have the most airtime of all three, both in quantity and in quality. The turns look snappier as well, as if Mack is trying to push the envelope a little further. I agree with Gazza, the layout really is varied!
I think if DC Rivals manages to be a little more intense than Helix, it would be the best Mack ever. Otherwise, it's a virtual tie between this and Helix!
Anyway, I've found some drone footage from OurWorlds. Great overview of the progress so far: