I'm a shameless TC Electronic ho, but I've been really happy with my Viscous Vibe, and have been planning on getting a Helix phaser.
The options you can tweak with the TonePrint software really does go beyond just about anything else out there.
Hell, Devin Townsend seems to be fond of them.. Viscous Vibe... Helix... umm... might be some language in those two... "That lizard is clearly up to no good," however, is one of the funniest lines I've ever heard in a review.
Helix arrived Sunday. SA Lunar today. Keeping one of them. So far the best Tone Print I've run on the Helix is the Petrucci. It's pretty darned good.
Try out making your own TonePrint in the software, see how far that can take you.
Winner is the Helix. The Lunar is going back. Why? I prefer the mix control on the face of the helix vs having to set it in the software on the Lunar. And honestly the Helix just flat out sounds better to my ears. The Lunar can do a lot of things but those things aren't rocking my world.
IMO, the three pedals that need to be "real" and not digital sims are Wah, Fuzz and Uni-Vibe. The way the odd impedances interact with each other and the guitar pickups is very unique. Everything else can be simulated pretty well at this point, and if you don't need the uniqueness of a Vibe, there are quite a few good phasers that can cop a similar vibe for a lot less money. (In fact, even though I am a Vibe fan, I've played Breathe with a Small Stone and Too Rolling Stoned with a Phase 90, no one cared other than me.)
That being said, maybe the Viscous Vibe will change my mind! Really I'd love a mini Helix, especially with the Tone Print you can probably dial in a great phaser with it.