I've gone for Zadra here. I haven't ridden it but I've always felt Helix is (ever so slightly) overrated. Certainly the queue line / station (other than the music) doesn't impress me all that much.
Zadra looks like the best RMC in Europe. I look forward to experiencing it although, again, it doesn't quite look like the complete package (a la Taron, Lech) to me.
I find the notion that someone (above) could prefer Hyperion to Helix very very odd indeed however. Although they're very different ride types and that is a different discussion.