Helix is due a big update soon, supposedly a game changer. That will be the time to make the comparison. Someone said the Helix is at the end of its life cycle, it isn't. There are no imminent plans for a Helix 2 yet, just improvements.
I feel like if fm9 had snapshots added, that would be irresistible, but if Helix had better cabs or just improvements to some of the amp sims, that would be enough to not change to fractal. Once this update is launched, it will be interesting to see how the Helix is comparing to the fm9